Re: [CentOS] Infrastructure HELP!
On 10/30/2009 10:49 AM, ML wrote: >> Also, lets keep the soliciting for business off this list please. > > Didn't you just contradict yourself? > > How can we support companies that contribute and help the project if > we don't know what each others companies do and specialize in? No, not really. I dont want to see this list converted into something that is used to solicit for business. my first comment is something generic that needs to get wider airing in the open source marketplaces - support the companies that in turn contribute - not at an individual level - to the projects directly. Maybe we need to be more public about who is doing what for the project - although at the moment its mostly hosting companies, and they are all listed at www.centos.org/mirrors - KB ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
Karan, >> Also, when you move to a hosted solution, I would appreciate >> your considering my company for it. > > I would highly recommend people consider companies that contribute and > help with the project rather than those that dont. > > Also, lets keep the soliciting for business off this list please. Didn't you just contradict yourself? How can we support companies that contribute and help the project if we don't know what each others companies do and specialize in? -ML ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
On 10/29/2009 06:11 PM, Neil Aggarwal wrote: > Also, when you move to a hosted solution, I would appreciate > your considering my company for it. I would highly recommend people consider companies that contribute and help with the project rather than those that dont. Also, lets keep the soliciting for business off this list please. - KB ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
On 10/29/2009 05:59 PM, Neil Aggarwal wrote: > > If you want speed, use RAID 10. > Neil, you have been on the list long enough to know howto use it and work with the other people on the list, so keeping that in mind - dont top post. most of the stuff coming from you just breaks the thread. - KB ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
Looks like the price has gone up with the economy starting to recover. I paid $68 per WD RE3 500GB drive on Amazon.com back in June. I would still recommend going with 4 drives in RAID 10 over 2 in RAID 1 or even 3 drives in RAID 5. You will get almost double the performance due to being able to stripe across the drives. RAID 1 is just a mirror so you are only going to see the performance of a single drive. I have experience with software RAID levels 1 and 5 with mdadm. My file server has a RAID 1 of 2 x 160GB Seagate SATA Drives and a RAID 5 of 3 x 1TB Hitachi SATA drives. For the RAID 1 drives hdparm shows approx 68MB/s for each drive and 68MB/s for the array. With the RAID 5 I am seeing 82 MB/s for the drive and 140MB/s for the array. Keep in mind this is an older Pentium D with the drives connected to an Supermicro LSI 1068 SAS controller. My ESXi box has a RAID 10 of 4 x 500GB Western Digital RE3 drives on a PERC 6/i controller. The PERC is a Dell branded LSI controller. Inside the virtual machines I am getting 148MB/s. Unfortunately I can't test this at the ESXi level, but the MB/s will defiantly be higher as the virtual machine has another layer to go through. Ryan On Thu, Oct 29, 2009 at 3:25 PM, ML wrote: > Ryan, > >> If you want performance stick with RAID 10. In general the more drives >> (spindles) the faster the array. The Western Digital RE3 500 GB drives >> are a good deal. You should be able to get 4 of those in the low >> $200s. In RAID 10 this would give you better performance than 2 x 1TB >> in RAID 1. >> > They are like $89.99 a piece on NewEgg. I have a friend that has 1 x > 1TB Seagate Raid level drives he will sell me for $100 each. > > Is software RAID 10 decent performance? > > -Jason > >> Ryan >> >> On Thu, Oct 29, 2009 at 2:36 PM, ML >> wrote: >>> >>> On Oct 29, 2009, at 11:11 AM, Neil Aggarwal wrote: >>> RAID 10 is striping across mirrored drives. So, if you have 4 x 1TB drives, think of it as two separate 1 TB volumes. The system will write half your data to volume A and the other half to volume B. The data in volume A and B do not overlap. Now, each volume is composed of a mirrored set of drives. Anything written to volume A is actually stored on two drives. Anything written to volume B is actually stores on the other two drives. Does this make sense? Let me know if you need any more explanation. >>> >>> No it makes sense. >>> >>> I am contemplating if I really need 4 x 1tb in this system. I mean >>> how >>> much space with some photo's, web pages and MySQL take up if there >>> are >>> 5,000 subscribers to start up? >>> >>> Would 2 x 1TB enterprise drives be enough mirrored? >>> Also, when you move to a hosted solution, I would appreciate your considering my company for it. >>> >>> Sure, I will be doing a lot of research on that for sure. >>> ___ >>> 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 > > ___ > 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] Infrastructure HELP!
Craig White wrote: > there actually are server and consumer grade SATA drives and you should > be very careful about what you are buying. > an important consideration is error handling.cheap consumer SATA drives tend to delay error reporting as long as they physically can, doing many retries to try and recover the data themselves without host system(controller) intervention. the RAID controller would rather know about the error itself. enterprise and server grade drives are qualified by the raid vendors to operate correctly with the controller error handling mechanisms. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
Am 29.10.2009 um 21:50 schrieb Curt Mills: > On Thu, 29 Oct 2009, Matt wrote: > >> What is the cheapest SATA hardware raid card I can get at newegg.com? >> Seems like most turn out not to be true hardware raid that I have >> found and will not run on CentOS 4.8 without a great deal of grief. > > Not a direct answer to your question, but be careful of SATA drives. > > As I understand it SAS drives (Serially Attached SCSI) are designed > to handle server duty (multiple processes stepping the head 24/7), > whereas SATA drives (Serially attached ATA) are not. SATA drives if > used in servers will fail prematurely. They're great/cheap for home > use though. > > I've also heard that SATA-2 drives are more like SAS or SCSI drives > in this respect, as in they're designed for server duty. > > I probably heard the above on this very list in the past. > > Can someone confirm or deny? Making me look like a fool is ok, I'm > used to it. ;-) There are server-grade SATA2 drives. They're usually a bit louder but are designed to run 24/7. They can also deal better with vibrations. Desktop-drives are designed to run for maybe 10hours a day - but they can achieve more spin-up/spin-down cycles than server-grade SATA-drives. SAS drives deliver more IOP/s. You waste a lot of SATA-capacity to achieve the same amount of IOP/s. Really, for the stuff he wants to do, he does not need a lot of I/O - IMO. Without knowing what kind of social networking site he has in mind, I'd say that the traffic of 5000 users (of course, not 5000 simultaneous users) can easily be handled by a single server with enough RAM. Rainer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
On Fri, 2009-10-30 at 09:57 +1300, Clint Dilks wrote: > > Curt Mills wrote: > > On Thu, 29 Oct 2009, Matt wrote: > > > > > >> What is the cheapest SATA hardware raid card I can get at newegg.com? > >> Seems like most turn out not to be true hardware raid that I have > >> found and will not run on CentOS 4.8 without a great deal of grief. > >> > > > > Not a direct answer to your question, but be careful of SATA drives. > > > > As I understand it SAS drives (Serially Attached SCSI) are designed > > to handle server duty (multiple processes stepping the head 24/7), > > whereas SATA drives (Serially attached ATA) are not. SATA drives if > > used in servers will fail prematurely. They're great/cheap for home > > use though. > > > > I've also heard that SATA-2 drives are more like SAS or SCSI drives > > in this respect, as in they're designed for server duty. > > > > I probably heard the above on this very list in the past. > > > > Can someone confirm or deny? Making me look like a fool is ok, I'm > > used to it. ;-) > > > > > We use SATA in a number of Production Systems. If its server class > hardware I haven't seen issues. So I wouldn't treat this as a big concern. there actually are server and consumer grade SATA drives and you should be very careful about what you are buying. Then there's the thought that any SATA drive runs the risk of data loss in a RAID-5 or RAID-6 setup... http://www.enterprisestorageforum.com/technology/features/article.php/3839636 Craig -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
> Not a direct answer to your question, but be careful of SATA drives. Seagate does make enterprise SATA drives. -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
Curt Mills wrote: > On Thu, 29 Oct 2009, Matt wrote: > > >> What is the cheapest SATA hardware raid card I can get at newegg.com? >> Seems like most turn out not to be true hardware raid that I have >> found and will not run on CentOS 4.8 without a great deal of grief. >> > > Not a direct answer to your question, but be careful of SATA drives. > > As I understand it SAS drives (Serially Attached SCSI) are designed > to handle server duty (multiple processes stepping the head 24/7), > whereas SATA drives (Serially attached ATA) are not. SATA drives if > used in servers will fail prematurely. They're great/cheap for home > use though. > > I've also heard that SATA-2 drives are more like SAS or SCSI drives > in this respect, as in they're designed for server duty. > > I probably heard the above on this very list in the past. > > Can someone confirm or deny? Making me look like a fool is ok, I'm > used to it. ;-) > > We use SATA in a number of Production Systems. If its server class hardware I haven't seen issues. So I wouldn't treat this as a big concern. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
On Thu, 29 Oct 2009, Matt wrote: > What is the cheapest SATA hardware raid card I can get at newegg.com? > Seems like most turn out not to be true hardware raid that I have > found and will not run on CentOS 4.8 without a great deal of grief. Not a direct answer to your question, but be careful of SATA drives. As I understand it SAS drives (Serially Attached SCSI) are designed to handle server duty (multiple processes stepping the head 24/7), whereas SATA drives (Serially attached ATA) are not. SATA drives if used in servers will fail prematurely. They're great/cheap for home use though. I've also heard that SATA-2 drives are more like SAS or SCSI drives in this respect, as in they're designed for server duty. I probably heard the above on this very list in the past. Can someone confirm or deny? Making me look like a fool is ok, I'm used to it. ;-) -- Curt Mills, WE7U hacker at fluke dot com Senior Methods Engineer/SysAdmin "Lotto: A tax on people who are bad at math." -- unknown "Windows: Microsoft's tax on computer illiterates." -- WE7U "The world DOES revolve around me: I picked the coordinate system!" Please be advised that this email may contain confidential information. If you are not the intended recipient, please do not read, copy or re-transmit this email. If you have received this email in error, please notify us by email by replying to the sender and by telephone (call us collect at +1 202-828-0850) and delete this message and any attachments. Thank you in advance for your cooperation and assistance. In addition, Danaher and its subsidiaries disclaim that the content of this email constitutes an offer to enter into, or the acceptance of, any contract or agreement or any amendment thereto; provided that the foregoing disclaimer does not invalidate the binding effect of any digital or other electronic reproduction of a manual signature that is included in any attachment to this email. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
Matt: Everyone I know recommends Areca cards. Neil -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime > -Original Message- > From: centos-boun...@centos.org > [mailto:centos-boun...@centos.org] On Behalf Of Matt > Sent: Thursday, October 29, 2009 3:44 PM > To: CentOS mailing list > Subject: Re: [CentOS] Infrastructure HELP! > > > $700, eesh. You can get some nice Areca cards for much > less than that. > > What is the cheapest SATA hardware raid card I can get at newegg.com? > Seems like most turn out not to be true hardware raid that I have > found and will not run on CentOS 4.8 without a great deal of grief. > > Matt > ___ > 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] Infrastructure HELP!
> $700, eesh. You can get some nice Areca cards for much less than that. What is the cheapest SATA hardware raid card I can get at newegg.com? Seems like most turn out not to be true hardware raid that I have found and will not run on CentOS 4.8 without a great deal of grief. Matt ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
> Is software RAID 10 decent performance? Given that you are just starting out, go with SW raid10. When your usage grows, plan to move to hardware raid or a hosted solution. Neil -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
> Is software RAID 10 decent performance? > depends on the workload. committed random writes are greatly accelerated by battery backed write caches on real raid controllers.this greatly speeds up things like transactional databases. if your workload is mostly read, software raid performs quite adequately. with 4 x raid10, you can be doing 4 different reads at once, or two writes simultaneously, as long as you have plenty of pending IO requests. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
Ryan, > If you want performance stick with RAID 10. In general the more drives > (spindles) the faster the array. The Western Digital RE3 500 GB drives > are a good deal. You should be able to get 4 of those in the low > $200s. In RAID 10 this would give you better performance than 2 x 1TB > in RAID 1. > They are like $89.99 a piece on NewEgg. I have a friend that has 1 x 1TB Seagate Raid level drives he will sell me for $100 each. Is software RAID 10 decent performance? -Jason > Ryan > > On Thu, Oct 29, 2009 at 2:36 PM, ML > wrote: >> >> On Oct 29, 2009, at 11:11 AM, Neil Aggarwal wrote: >> >>> RAID 10 is striping across mirrored drives. >>> >>> So, if you have 4 x 1TB drives, think of it as two separate >>> 1 TB volumes. The system will write half your data to >>> volume A and the other half to volume B. The data in volume >>> A and B do not overlap. >>> >>> Now, each volume is composed of a mirrored set of drives. >>> Anything written to volume A is actually stored on two drives. >>> Anything written to volume B is actually stores on the other two >>> drives. >>> >>> Does this make sense? >>> Let me know if you need any more explanation. >> >> No it makes sense. >> >> I am contemplating if I really need 4 x 1tb in this system. I mean >> how >> much space with some photo's, web pages and MySQL take up if there >> are >> 5,000 subscribers to start up? >> >> Would 2 x 1TB enterprise drives be enough mirrored? >> >>> Also, when you move to a hosted solution, I would appreciate >>> your considering my company for it. >> >> Sure, I will be doing a lot of research on that for sure. >> ___ >> 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 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
On Thu, Oct 29, 2009 at 02:07:22PM -0500, Neil Aggarwal wrote: > > If I can find a cheap enough RAID Card that wil fit the Mac Pro, I > > would do hardware RAID, but Apple wants $699 for theirs... > > $699 is pretty steep, but RAID cards are not cheap. > They are worth it for performance though. > > If you don't need absolute performance, software RAID will > work. > > Give with multiple smaller drives instead of two larger > ones. Agreed on this one. The bigger drives are great, but even in a mirror rebuild scenario the time to re-sync just gets longer and longer. More risk! $700, eesh. You can get some nice Areca cards for much less than that. Ray ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
> If I can find a cheap enough RAID Card that wil fit the Mac Pro, I > would do hardware RAID, but Apple wants $699 for theirs... $699 is pretty steep, but RAID cards are not cheap. They are worth it for performance though. If you don't need absolute performance, software RAID will work. Give with multiple smaller drives instead of two larger ones. Neil -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
If you want performance stick with RAID 10. In general the more drives (spindles) the faster the array. The Western Digital RE3 500 GB drives are a good deal. You should be able to get 4 of those in the low $200s. In RAID 10 this would give you better performance than 2 x 1TB in RAID 1. Ryan On Thu, Oct 29, 2009 at 2:36 PM, ML wrote: > > On Oct 29, 2009, at 11:11 AM, Neil Aggarwal wrote: > >> RAID 10 is striping across mirrored drives. >> >> So, if you have 4 x 1TB drives, think of it as two separate >> 1 TB volumes. The system will write half your data to >> volume A and the other half to volume B. The data in volume >> A and B do not overlap. >> >> Now, each volume is composed of a mirrored set of drives. >> Anything written to volume A is actually stored on two drives. >> Anything written to volume B is actually stores on the other two >> drives. >> >> Does this make sense? >> Let me know if you need any more explanation. > > No it makes sense. > > I am contemplating if I really need 4 x 1tb in this system. I mean how > much space with some photo's, web pages and MySQL take up if there are > 5,000 subscribers to start up? > > Would 2 x 1TB enterprise drives be enough mirrored? > >> Also, when you move to a hosted solution, I would appreciate >> your considering my company for it. > > Sure, I will be doing a lot of research on that for sure. > ___ > 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] Infrastructure HELP!
>> Would 2 x 1TB enterprise drives be enough mirrored? > > Are you going to to software RAID1 or hardware? > > I find software RAID1 bogs down for intensive database > applications. If I can find a cheap enough RAID Card that wil fit the Mac Pro, I would do hardware RAID, but Apple wants $699 for theirs... ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
> Would 2 x 1TB enterprise drives be enough mirrored? Are you going to to software RAID1 or hardware? I find software RAID1 bogs down for intensive database applications. NOTE: Host based RAID is the same as software RAID. You will need an actual external RAID card like one from Areca. Neil -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
ML schrieb: > Hi Everyone, > > I want to be sure the data is protected, but machine resources and > money are limited. > Why don't you rent a VPS for the time being and rsync the file+data to your MacPro, where you can use TimeMachine to create further backups? Rainer ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
On Oct 29, 2009, at 11:11 AM, Neil Aggarwal wrote: > RAID 10 is striping across mirrored drives. > > So, if you have 4 x 1TB drives, think of it as two separate > 1 TB volumes. The system will write half your data to > volume A and the other half to volume B. The data in volume > A and B do not overlap. > > Now, each volume is composed of a mirrored set of drives. > Anything written to volume A is actually stored on two drives. > Anything written to volume B is actually stores on the other two > drives. > > Does this make sense? > Let me know if you need any more explanation. No it makes sense. I am contemplating if I really need 4 x 1tb in this system. I mean how much space with some photo's, web pages and MySQL take up if there are 5,000 subscribers to start up? Would 2 x 1TB enterprise drives be enough mirrored? > Also, when you move to a hosted solution, I would appreciate > your considering my company for it. Sure, I will be doing a lot of research on that for sure. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
Curt Mills wrote: > On Thu, 29 Oct 2009, ML wrote: > > >> My question is about initial setup. The 4 x 1TB drives. How to set >> this up for I have some protection? >> >> RAID 0+1? (striped + mirrored) I would end up with 2TB useable space. >> >> RAID 5? so what one is a hot spare? 3TB useable space? >> >> What about striping the 4 1TB and mirroring that to a 4 x 1tb External >> drive enclosure? >> > > Plan for drives going out but keeping the site operational. Also > remember that RAID isn't a backup. > > RAID 5 is enticing because you get more usable space out of your > drives, but you have to be sure you'll only lose one drive at a time > and can get a replacement drive in there and sync'ed up before you > lose a 2nd one... If the drives were made by the same manufacturer > and were bought at about the same time you might easily lose 2 or > more, blowing up your array. > > Right. The problem with 1TB drives (and really, any modern drive with decent capacity) is that you're vulnerable until that array finishes rebuilding-- a process that's taking longer and longer. I'd go with the RAID10 solution that someone previously posited. By the time you outgrow that, you should really plan for a SAN/NAS solution anyway... -- Corey / KB1JWQ ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
On Thu, 29 Oct 2009, ML wrote: > My question is about initial setup. The 4 x 1TB drives. How to set > this up for I have some protection? > > RAID 0+1? (striped + mirrored) I would end up with 2TB useable space. > > RAID 5? so what one is a hot spare? 3TB useable space? > > What about striping the 4 1TB and mirroring that to a 4 x 1tb External > drive enclosure? Plan for drives going out but keeping the site operational. Also remember that RAID isn't a backup. RAID 5 is enticing because you get more usable space out of your drives, but you have to be sure you'll only lose one drive at a time and can get a replacement drive in there and sync'ed up before you lose a 2nd one... If the drives were made by the same manufacturer and were bought at about the same time you might easily lose 2 or more, blowing up your array. Go with RAID 1+0 (mirroring + striping) and you can potentially lose up to 1/2 of your drives and keep running. That's assuming you lose the correct 1/2... If you lose two drives in the same mirror you still go down. Combine the above with a good backup strategy. Backup software has been discussed on this list quite recently so look back a few days or weeks and you'll find some good links. Practice and document doing restores so that you know how to do them quickly without error when the pressure's on. Some of the backup software names/links I gleaned from this list recently: www.mondorescue.org www.nongnu.org/duplicity (de-dupe, S3) www.nongnu.org/storebackup (de-dupe) amanda backuppc (sourceforge) (rpm in epel) www.backula.org (de-dupe) -- Curt Mills, WE7U hacker at fluke dot com Senior Methods Engineer/SysAdmin "Lotto: A tax on people who are bad at math." -- unknown "Windows: Microsoft's tax on computer illiterates." -- WE7U "The world DOES revolve around me: I picked the coordinate system!" Please be advised that this email may contain confidential information. If you are not the intended recipient, please do not read, copy or re-transmit this email. If you have received this email in error, please notify us by email by replying to the sender and by telephone (call us collect at +1 202-828-0850) and delete this message and any attachments. Thank you in advance for your cooperation and assistance. In addition, Danaher and its subsidiaries disclaim that the content of this email constitutes an offer to enter into, or the acceptance of, any contract or agreement or any amendment thereto; provided that the foregoing disclaimer does not invalidate the binding effect of any digital or other electronic reproduction of a manual signature that is included in any attachment to this email. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
RAID 10 is striping across mirrored drives. So, if you have 4 x 1TB drives, think of it as two separate 1 TB volumes. The system will write half your data to volume A and the other half to volume B. The data in volume A and B do not overlap. Now, each volume is composed of a mirrored set of drives. Anything written to volume A is actually stored on two drives. Anything written to volume B is actually stores on the other two drives. Does this make sense? Let me know if you need any more explanation. Also, when you move to a hosted solution, I would appreciate your considering my company for it. Neil -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime > -Original Message- > From: centos-boun...@centos.org > [mailto:centos-boun...@centos.org] On Behalf Of ML > Sent: Thursday, October 29, 2009 1:03 PM > To: CentOS mailing list > Subject: Re: [CentOS] Infrastructure HELP! > > Neil, > Can you explain how RAID 10 would work with 4 x 1tb drives? > > Should I just get 2 x 2tb drives and mirror? > > I probably dont need 4 x 1tb drives to start, maybe even 2 x 2tb. I > can't image this growing faster than I can get money to add more > equipment, move to Co-Lo, etc. > > On Oct 29, 2009, at 10:59 AM, Neil Aggarwal wrote: > > > > > If you want speed, use RAID 10. > > > > Neil > > > > -- > > Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com > > CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated > > 64bit CPU > > 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero > > downtime > > > >> -Original Message- > >> From: centos-boun...@centos.org > >> [mailto:centos-boun...@centos.org] On Behalf Of ML > >> Sent: Thursday, October 29, 2009 12:57 PM > >> To: CentOS mailing list > >> Subject: [CentOS] Infrastructure HELP! > >> > >> Hi Everyone, > >> > >> I started a social networking site and I am getting ready > to go live > >> next week. I have limited fund as I am not funded yet (although > >> hopefully soon). > >> > >> I have an extra Mac Pro (I know, how can I possibly call a Mac Pro > >> dual 2.8 quad core with 16gb RAM extra). So Mac Pro quad Core, 16gb > >> RAM, 4 x 1tb RAID level Seagate drives. I was going to load > >> CentOS 5.4 > >> on it, web, mysql etc, etc. This is really the only box I have that > >> would handle the site it it takes off and then I would need to add > >> more hardware and most hosting to RackSpace or something. > >> > >> My question is about initial setup. The 4 x 1TB drives. How to set > >> this up for I have some protection? > >> > >> RAID 0+1? (striped + mirrored) I would end up with 2TB > useable space. > >> > >> RAID 5? so what one is a hot spare? 3TB useable space? > >> > >> What about striping the 4 1TB and mirroring that to a 4 x 1tb > >> External > >> drive enclosure? > >> > >> I want to be sure the data is protected, but machine resources and > >> money are limited. > >> > >> Thoughts are appreciated! > >> ___ > >> 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 > > ___ > 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] Infrastructure HELP!
Neil, Can you explain how RAID 10 would work with 4 x 1tb drives? Should I just get 2 x 2tb drives and mirror? I probably dont need 4 x 1tb drives to start, maybe even 2 x 2tb. I can't image this growing faster than I can get money to add more equipment, move to Co-Lo, etc. On Oct 29, 2009, at 10:59 AM, Neil Aggarwal wrote: > > If you want speed, use RAID 10. > > Neil > > -- > Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com > CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated > 64bit CPU > 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero > downtime > >> -Original Message- >> From: centos-boun...@centos.org >> [mailto:centos-boun...@centos.org] On Behalf Of ML >> Sent: Thursday, October 29, 2009 12:57 PM >> To: CentOS mailing list >> Subject: [CentOS] Infrastructure HELP! >> >> Hi Everyone, >> >> I started a social networking site and I am getting ready to go live >> next week. I have limited fund as I am not funded yet (although >> hopefully soon). >> >> I have an extra Mac Pro (I know, how can I possibly call a Mac Pro >> dual 2.8 quad core with 16gb RAM extra). So Mac Pro quad Core, 16gb >> RAM, 4 x 1tb RAID level Seagate drives. I was going to load >> CentOS 5.4 >> on it, web, mysql etc, etc. This is really the only box I have that >> would handle the site it it takes off and then I would need to add >> more hardware and most hosting to RackSpace or something. >> >> My question is about initial setup. The 4 x 1TB drives. How to set >> this up for I have some protection? >> >> RAID 0+1? (striped + mirrored) I would end up with 2TB useable space. >> >> RAID 5? so what one is a hot spare? 3TB useable space? >> >> What about striping the 4 1TB and mirroring that to a 4 x 1tb >> External >> drive enclosure? >> >> I want to be sure the data is protected, but machine resources and >> money are limited. >> >> Thoughts are appreciated! >> ___ >> 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 ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Infrastructure HELP!
If you want speed, use RAID 10. Neil -- Neil Aggarwal, (281)846-8957, http://www.JAMMConsulting.com CentOS 5.4 KVM VPS $55/mo, no setup fee, no contract, dedicated 64bit CPU 1GB dedicated RAM, 40GB RAID storage, 500GB/mo premium BW, Zero downtime > -Original Message- > From: centos-boun...@centos.org > [mailto:centos-boun...@centos.org] On Behalf Of ML > Sent: Thursday, October 29, 2009 12:57 PM > To: CentOS mailing list > Subject: [CentOS] Infrastructure HELP! > > Hi Everyone, > > I started a social networking site and I am getting ready to go live > next week. I have limited fund as I am not funded yet (although > hopefully soon). > > I have an extra Mac Pro (I know, how can I possibly call a Mac Pro > dual 2.8 quad core with 16gb RAM extra). So Mac Pro quad Core, 16gb > RAM, 4 x 1tb RAID level Seagate drives. I was going to load > CentOS 5.4 > on it, web, mysql etc, etc. This is really the only box I have that > would handle the site it it takes off and then I would need to add > more hardware and most hosting to RackSpace or something. > > My question is about initial setup. The 4 x 1TB drives. How to set > this up for I have some protection? > > RAID 0+1? (striped + mirrored) I would end up with 2TB useable space. > > RAID 5? so what one is a hot spare? 3TB useable space? > > What about striping the 4 1TB and mirroring that to a 4 x 1tb > External > drive enclosure? > > I want to be sure the data is protected, but machine resources and > money are limited. > > Thoughts are appreciated! > ___ > 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
