[CentOS-docs] Updates for Tips and Tricks/YUM and RPM page
(hoping this is the right way to submit updates for wiki pages.) from this page: http://wiki.centos.org/TipsAndTricks/YumAndRPM first, there's this line: yum --disable * --enable rpmforge list available i'm guessing that should be: yum --disablerepo * --enablerepo rpmforge list available also, near the bottom (Method B): For CentOS-5 - A package for rpmdevtools does not seem to be available. actually, there's one in EPEL for 5.5, but i don't know if you're counting packages that come from EPEL. in any event, there's certainly an rpmdevtools package that's installable on 5.5. rday -- Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ___ CentOS-docs mailing list CentOS-docs@centos.org http://lists.centos.org/mailman/listinfo/centos-docs
Re: [CentOS-docs] Updates for Tips and Tricks/YUM and RPM page
On Sat, 2010-09-25 at 07:07 -0400, Robert P. J. Day wrote: (hoping this is the right way to submit updates for wiki pages.) Made your recommended changes. Thanks, Phil ___ CentOS-docs mailing list CentOS-docs@centos.org http://lists.centos.org/mailman/listinfo/centos-docs
[CentOS-docs] why the weird avoidance of the name red hat?
i'm reading the FAQ: http://wiki.centos.org/FAQ/General and i'm familiar with the deliberate avoidance of using the name red hat, but it seems a bit weird given that point 1 clearly avoids it while point 2 boldly uses the name right in the question. so what's the point of being so coy, but not all the time? rday -- Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ___ CentOS-docs mailing list CentOS-docs@centos.org http://lists.centos.org/mailman/listinfo/centos-docs
[CentOS-docs] any chance of getting edit permission on the wiki?
just to fix obvious and trivial typoes that i'm running across, like on this page: http://wiki.centos.org/FAQ/CentOS5 notwithin you did not chose to reserve simple stuff like that. anything more involved, i'll post. rday -- Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ___ CentOS-docs mailing list CentOS-docs@centos.org http://lists.centos.org/mailman/listinfo/centos-docs
[CentOS-docs] possible additional comment regarding newer PHP
again, from here: http://wiki.centos.org/FAQ/CentOS5 regarding a newer version of PHP, a number of PHP experts that i know of suggest that, if you truly need an up-to-date version of PHP, you should: rpm -ivh http://rpms/famillecollet.com/enterprise/remi-release-5.rpm while remi collet's repo isn't official, it's accepted by numerous developers as a reliable source of newer PHP packages (5.3.3), so it seems that could be added with the appropriate disclaimer. rday -- Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ___ CentOS-docs mailing list CentOS-docs@centos.org http://lists.centos.org/mailman/listinfo/centos-docs
Re: [CentOS-docs] possible additional comment regarding newer PHP
On Sat, Sep 25, 2010 at 04:33:11PM -0400, Robert P. J. Day wrote: rpm -ivh http://rpms/famillecollet.com/enterprise/remi-release-5.rpm while remi collet's repo isn't official, it's accepted by numerous developers as a reliable source of newer PHP packages (5.3.3), so it seems that could be added with the appropriate disclaimer. We are, for the most part, recommending IUScommunity as the repo of choice for php-5.2 and php-5.3 these days on #centos. The URL above is also invalid. John -- Live a good life. If there are gods and they are just, they will not care how devout you have been, but will welcome you based on the virtues you have lived by. If there are gods, but unjust, then you should not want to worship them. If there are no gods, then you will be gone, but will have lived a noble life that will live on in the memories of your loved ones. -- Marcus Aurelius (121-180), philosopher and writer pgphr3b6myfYp.pgp Description: PGP signature ___ CentOS-docs mailing list CentOS-docs@centos.org http://lists.centos.org/mailman/listinfo/centos-docs
Re: [CentOS-docs] LUKS create_encrypted_fs
Maybe the df manual can help you:
-P, --portability use the POSIX output format
On 09/26/2010 01:02 AM, Jim Angstadt wrote:
Hi All,
This is my first post to centos-docs. I've read several months of
archives, but, this may be too trivial.
Re: http://wiki.centos.org/TipsAndTricks/EncryptedFilesystem/Scripts
This line:
FREE_SPACE=$(df -m $SECRET_PATH |grep / | awk '{ print $4 }')
gave me a problem due to line wrapping in df. For example:
$ df -m /home/ja/verify/
Filesystem 1M-blocks Used Available Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
589333289168269746 52% /
So, $4 is 52% rather than 269746.
The '/dev/mapper/VolGroup00-LogVol00' term is from a fresh install,
so, perhaps others have this same name.
This change worked for me:
FREE_SPACE=$(${DF} -m ${PATH} | ${GREP} / \
| ${TR} \n ' ' | ${TR} -s ' ' | ${CUT} -d' ' -f4)
Note the reformating onto 1 line with TR. The remainder could be what
I have, the original awk statement, or whatever. Thanks for your
consideration.
JIm
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Re: [CentOS-docs] LUKS create_encrypted_fs
On Sat, Sep 25, 2010 at 4:07 PM, Laszlo Fekete blackl...@ktk.bme.hu wrote: Maybe the df manual can help you: -P, --portability use the POSIX output format Thanks for you reply. Yes, that works also. Do you think that the page should be changed, or is this too trivial? Jim ___ CentOS-docs mailing list CentOS-docs@centos.org http://lists.centos.org/mailman/listinfo/centos-docs
Re: [CentOS-es] Squid + SquidGuard en Centos
Alguien tiene un how to para empezar con el DansGuardian? -Original Message- From: Fernando Rojas de la Torre fernando.ro...@uniondetula.gob.mx Reply-to: centos-es@centos.org To: centos-es@centos.org Subject: Re: [CentOS-es] Squid + SquidGuard en Centos Date: Thu, 23 Sep 2010 20:07:37 -0500 On 09/22/2010 09:48 PM, Dámaso Payares wrote: Fernando Jesús Rojas de la Torre escribió: El 21/09/10 21:16, Dámaso Payares escribió: José Lara escribió: Saludos A todos en la lista, actualmente tengo varios servidores montados sobre Red Hat 9 con Squid + SquidGuard, el asunto esta en que por razones obvias de soporte y parcheo ya red hat 9 carece de esto desde hace mucho tiempo, por lo cual estoy evaluando empezar a migrar estos servidores a Centos, pero tambien se suma el factor de que SquidGuard segun tengo entendido fue un proyecto abandonado hace un tiempo. quiero ver sus recomendaciones para cambiar estos servidores con sistema operativo Centos como base, Squid como proxy server y Algun suplente de SquidGuard que me brinde las mismas funciones que este brinda. espero sus comentarios, un cordial saludo, Jose Lara Rep. Dom. ___ CentOS-es mailing list CentOS-es@centos.org http://lists.centos.org/mailman/listinfo/centos-es Squid+Dansguardian : Instalas copia la configuración que tienes actualmente de squid y Dansguardian configuras el filtrado de contenido. ___ CentOS-es mailing list CentOS-es@centos.org http://lists.centos.org/mailman/listinfo/centos-es ¿pero, como resuelvo que las solicitudes a squid aparecen desde localhost? Necesito seguir trabajando con filtrado por ip de origen y al mismo tiempo tener trabajando dansguardian ___ CentOS-es mailing list CentOS-es@centos.org http://lists.centos.org/mailman/listinfo/centos-es La ip de origen te la da Dansguardian, si revisas los acces.log de verás todas las IP que estan ingresando a internet, si lo que quieres es ver un reporte de la navegación tipo Sarg, en Dansguardian le dices que los logs sean formato Squid. ___ CentOS-es mailing list CentOS-es@centos.org http://lists.centos.org/mailman/listinfo/centos-es ¿y se pueden seguir usando acls específicas para determinada ip de origen en squid? Digamos restricciones por tiempo, ancho de banda, etc.? ___ CentOS-es mailing list CentOS-es@centos.org http://lists.centos.org/mailman/listinfo/centos-es ___ CentOS-es mailing list CentOS-es@centos.org http://lists.centos.org/mailman/listinfo/centos-es
[CentOS] does having a centos wiki acct grant edit access?
i just registered for a centos wiki account, and was wondering if this gives me edit capability. i'm prepping for the first of a number of RHEL/centos basic admin courses and currently working my way thru the wiki, collecting neat tricks and ideas and, occasionally, i'll stumble over typoes -- some minor, some not so much. for instance, here: http://wiki.centos.org/TipsAndTricks/YumAndRPM#head-61731905d2e34ac343baeef06e5dd296aeed67b9 the command is listed as: yum --disable * --enable rpmforge list available i'm guessing that should actually be: yum --disablerepo * --enablerepo rpmforge list available no? but even if i got edit access, i'd still be happier if someone eventually checked out any changes i made to validate them. whatever works best. rday -- Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] does having a centos wiki acct grant edit access?
On 25/09/10 11:36, Robert P. J. Day wrote: i just registered for a centos wiki account, and was wondering if this gives me edit capability. i'm prepping for the first of a number of RHEL/centos basic admin courses and currently working my way thru the wiki, collecting neat tricks and ideas and, occasionally, i'll stumble over typoes -- some minor, some not so much. for instance, here: http://wiki.centos.org/TipsAndTricks/YumAndRPM#head-61731905d2e34ac343baeef06e5dd296aeed67b9 the command is listed as: yum --disable * --enable rpmforge list available i'm guessing that should actually be: yum --disablerepo * --enablerepo rpmforge list available no? but even if i got edit access, i'd still be happier if someone eventually checked out any changes i made to validate them. whatever works best. rday No, an account does not automatically give you edit rights, and you need to take this to the centos-docs list where a wiki editor will be happy to make the edits for you. Obtaining wiki edit rights isn't hard - you just need to demonstrate that you wish to contribute. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] does having a centos wiki acct grant edit access?
On Sat, 25 Sep 2010, Ned Slider wrote: No, an account does not automatically give you edit rights, and you need to take this to the centos-docs list where a wiki editor will be happy to make the edits for you. thanks muchly. rday -- Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
On 09/24/2010 07:50 PM, Digimer wrote: Raid 10 requires 4 drives. First you would make two RAID 0 arrays, then create a third array that is RAID 1 using the two RAID 0 arrays for it's devices. With only two drives, your option is RAID 1 (mirroring - proper redundancy) or RAID 0 (striping only - lose one drive and you lose *all* data). That's 0+1 not 1+0. And don't do it that way. If you have a single drive failure with RAID 0+1 you've lost *all* of your redundancy - one more failure and you are dead. If you create two RAID1 sets and then strip them into a RAID0 you get pretty much the same performance and space efficiency characteristics, but if you have a drive failure you still have partial redundancy. You could actually take a *second* drive failure as long as it was in the other RAID1 pair. With 4 drives raid0+1 can only survive 1 drive failure. With 4 drives in raid 1+0 you can survive an average of 1.67 drive failures. -- Benjamin Franz ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
On 09/25/2010 01:06 PM, Benjamin Franz wrote: If you have a single drive failure with RAID 0+1 you've lost *all* of your redundancy - one more failure and you are dead. If you create two Things get a bit 'grey' with the mdraid10 and extentions, look at : http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10 for an overview. - KB ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
Jacob Bresciani wrote: RAID10 requires at least 4 drives does it not? Since it's a strip set of mirrored disks, the smallest configuration I can see is 4 disks, 2 mirrored pairs stripped. He might be referring to what he can get from the mdraid10 (i know, Neil Brown could have chosen a better name) which is not quite the same as nested 1+0. Doing it the nested way, you need at least 4 drives. Using mdraid10 is another story. Thanks Neil for muddying the waters! ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] ca-bundle.crt expired
I notice that the certificate /etc/pki/tls/certs/ca-bundle.crt on my CentOS-5.5 system expired on 7 Jan 2010, although the openssl-0.9.8e-12.el5_4.6 package was updated in March. What is the point of this certificate? -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
On Sep 25, 2010, at 9:11 AM, Christopher Chan christopher.c...@bradbury.edu.hk wrote: Jacob Bresciani wrote: RAID10 requires at least 4 drives does it not? Since it's a strip set of mirrored disks, the smallest configuration I can see is 4 disks, 2 mirrored pairs stripped. He might be referring to what he can get from the mdraid10 (i know, Neil Brown could have chosen a better name) which is not quite the same as nested 1+0. Doing it the nested way, you need at least 4 drives. Using mdraid10 is another story. Thanks Neil for muddying the waters! True, but if you figure it out mdraid10 with 2 drives = raid1, you would need 3 drives to get the distributed copy feature of Neil's mdraid10. Mdraid10 actually allows for a 3 drive raid10 set. It isn't raid10 per say but a raid level based on distributing copies of chunks around the spindles for redundancy. For true RAID10 support in Linux you create multiple mdraid1 physical volumes, create a LVM volume group out of them and create logical volumes that interleave between these physical volumes. This can give you the ability to extend a LVM RAID10 VG by adding RAID10 PVs to the VG. Unfortunately there isn't a resilver feature to LVM so you need to create a new LV to stripe it across all the members afterward, so leave room in the VG to do that. -Ross ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Configuring BIND to answer to two domain names (four IP addresses)
On 9/24/10 11:12 PM, cpol...@surewest.net wrote: On Fri, Sep 24, 2010 at 10:28:41PM +0200, Dotan Cohen wrote: On Fri, Sep 24, 2010 at 22:24, Alexander Dallozad+li...@uni-x.org wrote: http://www.zytrax.com/books/dns/ That is a good source to read up about bind configuration. As a sidenote please be aware, that if someone directly queries your ns1.exampleA.com for exampleB.com zone records he will get proper answers. If you would need to prevent this for any reason you would need a extended bind config design using views. While the zytrax book has lessons about views you can too find a resource in http://www.cymru.com/Documents/secure-bind-template.html Wow, thank you! There is some good reading there, especially the security link. Lots of little holes to exploit! I will be up for the night! For completeness: there is the BIND 9 Administrator Reference Manual, known as the ARM, usually supplied under /usr/share/doc/. And what many consider to be the standard reference, Liu and Albitz's DNS and BIND published by O'Reilly. I believe it's up to the 5th edition now; an earlier edition used to be provided online. If you're serious about learning DNS you ought to consider this book. Learning bind is sort of like learning sendmail though. They both do a million things you'll never need (and if you do you should probably change your design...). The trick - especially when you start with the full references - is to figure out the simple part you need to understand and ignore the rest. And when using distribution-packaged versions, most of what you need is already there. -- Les Mikesell lesmikes...@gmail.com ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
On Sat, Sep 25, 2010 at 11:48 AM, Ross Walker rswwal...@gmail.com wrote: On Sep 25, 2010, at 9:11 AM, Christopher Chan christopher.c...@bradbury.edu.hk wrote: Jacob Bresciani wrote: RAID10 requires at least 4 drives does it not? Since it's a strip set of mirrored disks, the smallest configuration I can see is 4 disks, 2 mirrored pairs stripped. He might be referring to what he can get from the mdraid10 (i know, Neil Brown could have chosen a better name) which is not quite the same as nested 1+0. Doing it the nested way, you need at least 4 drives. Using mdraid10 is another story. Thanks Neil for muddying the waters! True, but if you figure it out mdraid10 with 2 drives = raid1, you would need 3 drives to get the distributed copy feature of Neil's mdraid10. I had posted earlier ( http://lists.centos.org/pipermail/centos/2010-September/099473.html ) that mdraid10 with two drives is basically raid1 but that it has some mirroring options. In the far layout mirroring option (where, according to WP, all the drives are divided into f sections and all the chunks are repeated in each section but offset by one device) reads are faster than mdraid1 or vanilla mdraid10 on two drives. For true RAID10 support in Linux you create multiple mdraid1 physical volumes, create a LVM volume group out of them and create logical volumes that interleave between these physical volumes. Vanilla mdraid10 with four drives is true raid10. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
On Sep 25, 2010, at 1:52 PM, Tom H tomh0...@gmail.com wrote: On Sat, Sep 25, 2010 at 11:48 AM, Ross Walker rswwal...@gmail.com wrote: On Sep 25, 2010, at 9:11 AM, Christopher Chan christopher.c...@bradbury.edu.hk wrote: Jacob Bresciani wrote: RAID10 requires at least 4 drives does it not? Since it's a strip set of mirrored disks, the smallest configuration I can see is 4 disks, 2 mirrored pairs stripped. He might be referring to what he can get from the mdraid10 (i know, Neil Brown could have chosen a better name) which is not quite the same as nested 1+0. Doing it the nested way, you need at least 4 drives. Using mdraid10 is another story. Thanks Neil for muddying the waters! True, but if you figure it out mdraid10 with 2 drives = raid1, you would need 3 drives to get the distributed copy feature of Neil's mdraid10. I had posted earlier ( http://lists.centos.org/pipermail/centos/2010-September/099473.html ) that mdraid10 with two drives is basically raid1 but that it has some mirroring options. In the far layout mirroring option (where, according to WP, all the drives are divided into f sections and all the chunks are repeated in each section but offset by one device) reads are faster than mdraid1 or vanilla mdraid10 on two drives. If you have any two copies of the same chunk on the same drive then redundancy is completely lost. Therefore without loosing redundancy mdraid10 over two drives will have to be identical to raid1. Reads on a raid1 can be serviced by either side of the mirror, I believe the policy is hard coded to round robin. I don't know if it is smart enough to distinguish sequential pattern from random and only service sequential reads from one side or not. For true RAID10 support in Linux you create multiple mdraid1 physical volumes, create a LVM volume group out of them and create logical volumes that interleave between these physical volumes. Vanilla mdraid10 with four drives is true raid10. Well like you stated above that depends on the near or far layout pattern, you can get the same performance as a raid10 or better in certain workloads, but it really isn't a true raid10 in the sense that it isn't a stripe set of raid1s, but a distributed mirror set. Now don't get me wrong I'm not saying it's not as good as a true raid10, in fact I believe it to be better as it provides way more flexibility and is a lot simpler of an implementation, but not really a raid10, but something completely new. -Ross ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
And don't do it that way. If you have a single drive failure with RAID 0+1 you've lost *all* of your redundancy - one more failure and you are dead. If you create two RAID1 sets and then strip them into a RAID0 you get pretty much the same performance and space efficiency characteristics, but if you have a drive failure you still have partial redundancy. You could actually take a *second* drive failure as long as it was in the other RAID1 pair. With 4 drives raid0+1 can only survive 1 drive failure. With 4 drives in raid 1+0 you can survive an average of 1.67 drive failures. Indeed. This article explains the odds of loosing data with RAID 1+0 vs 0+1: Why is RAID 1+0 better than RAID 0+1? http://www.aput.net/~jheiss/raid10/ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
Thanks for all of the inputs...I finally came across a good article summarizing what I needed, looks like I am going to try to the f2 option and then do some testing vs the default n2 option. I am building the array as we speak but it looks like building the f2 option will take 24hrs vs 2hrs for the n2 optionthis is on 2 1TB hdd On Sat, Sep 25, 2010 at 3:04 PM, Ross Walker rswwal...@gmail.com wrote: On Sep 25, 2010, at 1:52 PM, Tom H tomh0...@gmail.com wrote: On Sat, Sep 25, 2010 at 11:48 AM, Ross Walker rswwal...@gmail.com wrote: On Sep 25, 2010, at 9:11 AM, Christopher Chan christopher.c...@bradbury.edu.hk wrote: Jacob Bresciani wrote: RAID10 requires at least 4 drives does it not? Since it's a strip set of mirrored disks, the smallest configuration I can see is 4 disks, 2 mirrored pairs stripped. He might be referring to what he can get from the mdraid10 (i know, Neil Brown could have chosen a better name) which is not quite the same as nested 1+0. Doing it the nested way, you need at least 4 drives. Using mdraid10 is another story. Thanks Neil for muddying the waters! True, but if you figure it out mdraid10 with 2 drives = raid1, you would need 3 drives to get the distributed copy feature of Neil's mdraid10. I had posted earlier ( http://lists.centos.org/pipermail/centos/2010-September/099473.html ) that mdraid10 with two drives is basically raid1 but that it has some mirroring options. In the far layout mirroring option (where, according to WP, all the drives are divided into f sections and all the chunks are repeated in each section but offset by one device) reads are faster than mdraid1 or vanilla mdraid10 on two drives. If you have any two copies of the same chunk on the same drive then redundancy is completely lost. Therefore without loosing redundancy mdraid10 over two drives will have to be identical to raid1. Reads on a raid1 can be serviced by either side of the mirror, I believe the policy is hard coded to round robin. I don't know if it is smart enough to distinguish sequential pattern from random and only service sequential reads from one side or not. For true RAID10 support in Linux you create multiple mdraid1 physical volumes, create a LVM volume group out of them and create logical volumes that interleave between these physical volumes. Vanilla mdraid10 with four drives is true raid10. Well like you stated above that depends on the near or far layout pattern, you can get the same performance as a raid10 or better in certain workloads, but it really isn't a true raid10 in the sense that it isn't a stripe set of raid1s, but a distributed mirror set. Now don't get me wrong I'm not saying it's not as good as a true raid10, in fact I believe it to be better as it provides way more flexibility and is a lot simpler of an implementation, but not really a raid10, but something completely new. -Ross ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
Mdraid10 actually allows for a 3 drive raid10 set. It isn't raid10 per say but a raid level based on distributing copies of chunks around the spindles for redundancy. Isn't this what they call RAID 1e (RAID 1 Enhanced), which needs a minimum of 3 drives? This seems to me a much better name for it than calling it RAID 10... ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
Miguel Medalha wrote: Mdraid10 actually allows for a 3 drive raid10 set. It isn't raid10 per say but a raid level based on distributing copies of chunks around the spindles for redundancy. Isn't this what they call RAID 1e (RAID 1 Enhanced), which needs a minimum of 3 drives? This seems to me a much better name for it than calling it RAID 10... ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos Yes it is Raid-1E. This is explicitly documented in the link that Karanbir provided... http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10 Nataraj ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
On Sep 25, 2010, at 4:15 PM, Miguel Medalha miguelmeda...@sapo.pt wrote: Mdraid10 actually allows for a 3 drive raid10 set. It isn't raid10 per say but a raid level based on distributing copies of chunks around the spindles for redundancy. Isn't this what they call RAID 1e (RAID 1 Enhanced), which needs a minimum of 3 drives? This seems to me a much better name for it than calling it RAID 10... The raid1e type probably didn't exist when Neil Brown came up with the algorithm. He should have patented it though... Maybe he started out with the idea to create a raid10, but didn't want the complexity of managing sub-arrays so decided just to redistribute chunk copies instead and then it took off from there. -Ross ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Mock on 5.5 x86_64 failing with Could not find useradd in chroot, maybe the install failed?
I am atempting to work with some rpms in the c5-testing repo. When I add: [c5-testing] name=CentOS-5 Testing baseurl=http://dev.centos.org/centos/5/testing/x86_64/ gpgcheck=1 gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing to centos-5-x86_64.cfg, saving as centos-5-x86_64-testdev.cfg I get the aformentioned error. Example [mockbu...@localhost ~]$ mock -r centos-5-x86_64-testdev.cfg init init clean prep This may take a while Could not find useradd in chroot, maybe the install failed? ending done -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100- - +1 (443) 269-1555 x333Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Mock on 5.5 x86_64 failing with Could not find useradd inchroot, maybe the install failed? [SOLVED]
Solved, -Original Message- From: centos-boun...@centos.org [mailto:centos-boun...@centos.org] On Behalf Of Jason Pyeron Sent: Saturday, September 25, 2010 17:22 To: 'CentOS mailing list' Subject: [CentOS] Mock on 5.5 x86_64 failing with Could not find useradd inchroot, maybe the install failed? I am atempting to work with some rpms in the c5-testing repo. When I add: [c5-testing] name=CentOS-5 Testing baseurl=http://dev.centos.org/centos/5/testing/x86_64/ Commenting out the GPG lines avoids the issue. gpgcheck=1 gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing Ex: [mockbu...@localhost ~]$ mock -r centos-5-x86_64-testdev.cfg init init clean prep This may take a while ending done Finished initializing root [mockbu...@localhost ~]$ mock -r centos-5-x86_64-testdev.cfg backuppc-3.1.0-1.el5.centos.src.rpm init clean prep This may take a while setup build ending done Results and/or logs in: /var/lib/mock/centos-5-x86_64/result -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100- - +1 (443) 269-1555 x333Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
The raid1e type probably didn't exist when Neil Brown came up with the algorithm. You are probably right. He should have patented it though... Maybe... Maybe he started out with the idea to create a raid10, but didn't want the complexity of managing sub-arrays so decided just to redistribute chunk copies instead and then it took off from there. Yes. I didn't want to sound harsh to him. I am VERY grateful for his outstanding work. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Raid 10 questions...2 drive
On Sat, Sep 25, 2010 at 4:04 PM, Ross Walker rswwal...@gmail.com wrote: On Sep 25, 2010, at 1:52 PM, Tom H tomh0...@gmail.com wrote: On Sat, Sep 25, 2010 at 11:48 AM, Ross Walker rswwal...@gmail.com wrote: On Sep 25, 2010, at 9:11 AM, Christopher Chan christopher.c...@bradbury.edu.hk wrote: Jacob Bresciani wrote: RAID10 requires at least 4 drives does it not? Since it's a strip set of mirrored disks, the smallest configuration I can see is 4 disks, 2 mirrored pairs stripped. He might be referring to what he can get from the mdraid10 (i know, Neil Brown could have chosen a better name) which is not quite the same as nested 1+0. Doing it the nested way, you need at least 4 drives. Using mdraid10 is another story. Thanks Neil for muddying the waters! True, but if you figure it out mdraid10 with 2 drives = raid1, you would need 3 drives to get the distributed copy feature of Neil's mdraid10. I had posted earlier ( http://lists.centos.org/pipermail/centos/2010-September/099473.html ) that mdraid10 with two drives is basically raid1 but that it has some mirroring options. In the far layout mirroring option (where, according to WP, all the drives are divided into f sections and all the chunks are repeated in each section but offset by one device) reads are faster than mdraid1 or vanilla mdraid10 on two drives. If you have any two copies of the same chunk on the same drive then redundancy is completely lost. Therefore without loosing redundancy mdraid10 over two drives will have to be identical to raid1. Reads on a raid1 can be serviced by either side of the mirror, I believe the policy is hard coded to round robin. I don't know if it is smart enough to distinguish sequential pattern from random and only service sequential reads from one side or not. For true RAID10 support in Linux you create multiple mdraid1 physical volumes, create a LVM volume group out of them and create logical volumes that interleave between these physical volumes. Vanilla mdraid10 with four drives is true raid10. Well like you stated above that depends on the near or far layout pattern, you can get the same performance as a raid10 or better in certain workloads, but it really isn't a true raid10 in the sense that it isn't a stripe set of raid1s, but a distributed mirror set. Now don't get me wrong I'm not saying it's not as good as a true raid10, in fact I believe it to be better as it provides way more flexibility and is a lot simpler of an implementation, but not really a raid10, but something completely new. You must've misunderstood me. mdraid10 on two disks: it is raid1 but you have the option of mirroring, for example, cylinder 24 on disk 1 with cylinder 48 on disk 2; the Wikipedia article says that it makes reads faster (I don't understand why but that's a different story). mdraid10 on four disks: it is true raid10 but you also have various --layout= options. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] (In)(x)sane privilege/access issue
I just picked up a new HP OfficeJet J3680 all-in-one (because, as previously posted, my 4315 broke), and I was able to install the printer using the latest hplip's hp-setup command, BUT: My sane: libsane-hpaio.x86_64 1.6.7-4.1.el5.4 installed sane-backends.x86_64 1.0.18-5.el5installed sane-backends-devel.i386 1.0.18-5.el5installed sane-backends-devel.x86_64 1.0.18-5.el5installed sane-backends-libs.i3861.0.18-5.el5installed sane-backends-libs.x86_64 1.0.18-5.el5installed sane-frontends.x86_64 1.0.14-1.2.2installed xsane.x86_64 0.991-5.el5 installed xsane-gimp.x86_64 0.991-5.el5 installed doesn't recognize that there is a scanner out there and only loads the interface for my old ScanJet 3300C: [...@marichter ~]$ lsusb Bus 001 Device 001: ID : Bus 002 Device 012: ID 03f0:0205 Hewlett-Packard ScanJet 3300c Bus 002 Device 006: ID 04f9:0033 Brother Industries, Ltd Bus 002 Device 001: ID : In fact, the new scanner doesn't even show up unless: [...@marichter ~]$ sudo lsusb [sudo] password for mar: Bus 001 Device 001: ID : Bus 002 Device 015: ID 03f0:3112 Hewlett-Packard Bus 002 Device 012: ID 03f0:0205 Hewlett-Packard ScanJet 3300c Bus 002 Device 006: ID 04f9:0033 Brother Industries, Ltd Bus 002 Device 001: ID : If I run xsane from the command line as root (i.e., with sudo), then it works, but then I also get that WARNING DANGER WILL ROBINSON message, which is both annoying and probably likely to cause problems with file permissions on my scans. So, how do I (a non-root user) get x/sane to see the new USB device when it only appears to visible to the root user? What am I missing? Thanks. Mark ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
