Re: Setting up gmirror
As I asked in another thread, what is the problem with the load algorith? Thanks 2008/11/6 Volodymyr Kostyrko [EMAIL PROTECTED] Carl wrote: What are the considerations in choosing between load, prefer, round-robin, and split balance algorithms? load is currently not good at high loads, pr's pending... -- Sphinx of black quartz judge my vow. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] -- Gabriel Lavoie [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
Gabriel Lavoie wroted: As I asked in another thread, what is the problem with the load algorith? I've already pointed you in the other tread to http://www.freebsd.org/cgi/query-pr.cgi?pr=113885 :) -- Sphinx of black quartz judge my vow. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
Carl wrote: What are the considerations in choosing between load, prefer, round-robin, and split balance algorithms? load is currently not good at high loads, pr's pending... -- Sphinx of black quartz judge my vow. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
What are the considerations in choosing between load, prefer, round-robin, and split balance algorithms? load is currently not good at high loads, pr's pending... so change it to round-robin? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
I thought the -s option was only applicable when using -b split for the balancing algorithm. Does round-robin not mean simply alternating between the two disks without ever splitting requests? no. it means for example with -s 65536 and 1MB request - it will split this request on 2 disks So there is no difference between split and round-robin algorithms then? looks there is. i never used split balance. always round-robin or load. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
re: Setting up gmirror
disk will be overwritten). Add another disk to this mirror, so it will be synchronized with existing disk: gmirror label -v -b round-robin data da0 add -s very large value like -s 1048576 to prevent splitting one request on 2 disks. I thought the -s option was only applicable when using -b split for the balancing algorithm. Does round-robin not mean simply alternating between the two disks without ever splitting requests? no. it means for example with -s 65536 and 1MB request - it will split this request on 2 disks ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
Wojciech Puchar wrote: disk will be overwritten). Add another disk to this mirror, so it will be synchronized with existing disk: gmirror label -v -b round-robin data da0 add -s very large value like -s 1048576 to prevent splitting one request on 2 disks. I thought the -s option was only applicable when using -b split for the balancing algorithm. Does round-robin not mean simply alternating between the two disks without ever splitting requests? no. it means for example with -s 65536 and 1MB request - it will split this request on 2 disks So there is no difference between split and round-robin algorithms then? Carl / K0802647 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
re: Setting up gmirror
Wojciech Puchar wrote: Andrew Falanga wrote: Identical drive models so their sizes are the same. Is this the command, from gmirror(8), the one I'll want to use? Create a mirror on disk with valid data (note that the last sector of the disk will be overwritten). Add another disk to this mirror, so it will be synchronized with existing disk: gmirror label -v -b round-robin data da0 add -s very large value like -s 1048576 to prevent splitting one request on 2 disks. I thought the -s option was only applicable when using -b split for the balancing algorithm. Does round-robin not mean simply alternating between the two disks without ever splitting requests? What are the considerations in choosing between load, prefer, round-robin, and split balance algorithms? Carl / K0802647 ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
Hi, I've just finished setting up a new web server, and if I get my DNS stuff correct hopefully an e-mail server too, for my church. Originally, the intention was to use RAID1 on the MOBO. However, the do not ever use hardware RAID0/1/10 on motherboard. first it's not hardware, it's purely software, second there is nothing to be accelerated by hardware on RAID0/1/10. use gmirror/gstripe/gconcat everywhere. make any mention of gmirror(8). It seems like gmirror is rather easy gmirror is easy to set up and works excellent. Identical drive models so their sizes are the same. Is this the command, from gmirror(8), the one I'll want to use? Create a mirror on disk with valid data (note that the last sector of the disk will be overwritten). Add another disk to this mirror, so it will be synchronized with existing disk: gmirror label -v -b round-robin data da0 add -s very large value like -s 1048576 to prevent splitting one request on 2 disks. except this - all right. gmirror insert data da1 Though in my case, da0 and da1 will be ad4 and ad5. This seems to be the one I'm looking for, I'm just scared of wiping out more than I bargain for. assuming you already have system on say ad4, make gmirror on ad5, copy everything, make sure it's bootable (bsdlabel -B ...), boot from it, if all works, add ad4 to the mirror effectively overwriting things. add in loader.conf vfs.root.mountfrom=ufs:mirror/dataa - assuming your system is on partition a of your mirror. HINT - you DO NOT have to mirror whole drive. you may mirror a partition(s), living some of them unmirrored. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
On Tue, Sep 30, 2008 at 10:34:53PM -0600, Andrew Falanga wrote: I've just finished setting up a new web server, and if I get my DNS stuff correct hopefully an e-mail server too, for my church. Originally, the intention was to use RAID1 on the MOBO. However, the RAID controller on the MOBO consistently tried to make the SATA DVD drive part of the RAID array and wouldn't boot the FreeBSD boot disk. So, at the suggestion of another respondent here, I've decided to use gmirror. Stay away from BIOS-level RAID. If you want evidence of why, especially with regards to Intel MatrixRAID, here you go: http://wiki.freebsd.org/JeremyChadwick/ATA_issues_and_troubleshooting And yes, these are FreeBSD problems, but the severity is so high that there is a very good chance you will lose your data in the case of a failure. Simply put, don't risk it. Stick with gmirror or ZFS, unless you have reason to use ccd (it's old, but it does still work). -- | Jeremy Chadwickjdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
with regards to Intel MatrixRAID, here you go: http://wiki.freebsd.org/JeremyChadwick/ATA_issues_and_troubleshooting And yes, these are FreeBSD problems, but the severity is so high that there is a very good chance you will lose your data in the case of a failure. Simply put, don't risk it. BIOS RAIDs are software RAIDs. FreeBSD driver for this is software RAID too, just like gmirror but worse and less portable. simply doesn't make sense. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
On Wed, Oct 01, 2008 at 09:22:20AM +0200, Wojciech Puchar wrote: with regards to Intel MatrixRAID, here you go: http://wiki.freebsd.org/JeremyChadwick/ATA_issues_and_troubleshooting And yes, these are FreeBSD problems, but the severity is so high that there is a very good chance you will lose your data in the case of a failure. Simply put, don't risk it. BIOS RAIDs are software RAIDs. FreeBSD driver for this is software RAID too, just like gmirror but worse and less portable. simply doesn't make sense. And what exactly do you classify controllers such as the Promise TX4310 and the Promise S150 SX4 as? The TX4310 could be classified as software RAID, but a few of the features are offloaded onto the controller. The SX4 is the same way, but has actual on-board cache. You like to declare everything as software RAIDs, while I like to discern the difference between them using (what I believe to be) more accurate terminology: BIOS-level RAID (Adaptec HostRAID, Intel MatrixRAID; chipset RAID) OS-based RAID (gvinum, ccd, etc.) Hardware RAID (LSI Logic, 3Ware, Areca controllers) There is always a certain degree of software (specifically, processing/work done on the main system's CPU) in all of those, since there is always a driver involved for interfacing with the cards -- even ones with dedicated CPUs like the Intel IOP/XScale. -- | Jeremy Chadwickjdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
And what exactly do you classify controllers such as the Promise TX4310 and the Promise S150 SX4 as? The TX4310 could be classified as software RAID, but a few of the features are offloaded onto the controller. The SX4 is the same way, but has actual on-board cache. si it do something by hardware. anyway - i don't think it will actually make it faster under FreeBSD (contrary to windoze). it's simply not worth money. You like to declare everything as software RAIDs, while I like to discern the difference between them using (what I believe to be) more accurate terminology: BIOS-level RAID (Adaptec HostRAID, Intel MatrixRAID; chipset RAID) OS-based RAID (gvinum, ccd, etc.) what are the difference between 1 and 2? there are none. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
On Wed, Oct 01, 2008 at 11:19:01AM +0200, Wojciech Puchar wrote: And what exactly do you classify controllers such as the Promise TX4310 and the Promise S150 SX4 as? The TX4310 could be classified as software RAID, but a few of the features are offloaded onto the controller. The SX4 is the same way, but has actual on-board cache. si it do something by hardware. anyway - i don't think it will actually make it faster under FreeBSD (contrary to windoze). it's simply not worth money. You like to declare everything as software RAIDs, while I like to discern the difference between them using (what I believe to be) more accurate terminology: BIOS-level RAID (Adaptec HostRAID, Intel MatrixRAID; chipset RAID) OS-based RAID (gvinum, ccd, etc.) what are the difference between 1 and 2? there are none. With regards to Intel MatrixRAID, you're correct -- all the feature does is provide disk pairing features via the southbridge, and provide an option ROM which configures and manages metadata on the disks for the OS to read and make use of. All the I/O operations still have to go through the CPU, and nothing is off-loaded. The reason I discern the difference is because if you tell a user yes, your Intel MatrixRAID is software RAID, they become confused, since the feature is provided on a dedicated chip (ICHx). But software RAID is done in the operating system, like gvinum! There is also one difference which you're forgetting: booting. FreeBSD has a long-standing history of not being able to boot off of most anything other than UFS and gmirror; I believe gvinum might work, but I've only been able to find confirmation that gmirror does. I'm under the impression gstripe doesn't, and ZFS definitely does not. By using an additional (lower) layer that the OS has no control over (e.g. MatrixRAID), you can get around this limitation, because the OS considers the disks a single device (e.g. /dev/ar0). Of course, you run into other problems using MatrixRAID on FreeBSD, specifically when a disk fails (see my Wiki page), and the negatives there easily outweigh the positives. If you have a RAID-0 configuration you want to boot from, I've no idea what will work. If you have a RAID-1 configuration you want to boot from, gmirror is a good choice. If you have a RAID-5 or other configuration you want to boot from, a software or hardware RAID controller would be sufficient (see above). -- | Jeremy Chadwickjdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
There is also one difference which you're forgetting: booting. for me there is no problem. simply put /boot at the beginning of mirror or small partition it's that simple ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
Wednesday, October 1, 2008 6:34 AM From: Andrew Falanga [EMAIL PROTECTED] To: freebsd-questions@freebsd.org freebsd-questions@freebsd.org Hi, I've just finished setting up a new web server, and if I get my DNS stuff correct hopefully an e-mail server too, for my church. Originally, the intention was to use RAID1 on the MOBO. However, the RAID controller on the MOBO consistently tried to make the SATA DVD drive part of the RAID array and wouldn't boot the FreeBSD boot disk. So, at the suggestion of another respondent here, I've decided to use gmirror. Now, it seems that gmirror is, perhaps, newer to FreeBSD than the software RAID stuff in the Handbook. That mentions ccd(4) and doesn't make any mention of gmirror(8). It seems like gmirror is rather easy to work with, and more important, easy to recover from is hardware fails. In any event, I want to make sure I'm understanding the manual page correctly because I don't have anything else to test this on except the churches computer. We have two Seagate 250gb SATA drives. Identical drive models so their sizes are the same. Is this the command, from gmirror(8), the one I'll want to use? Create a mirror on disk with valid data (note that the last sector of the disk will be overwritten). Add another disk to this mirror, so it will be synchronized with existing disk: gmirror label -v -b round-robin data da0 gmirror insert data da1 Though in my case, da0 and da1 will be ad4 and ad5. This seems to be the one I'm looking for, I'm just scared of wiping out more than I bargain for. Andy -- A: Because it messes up the order in which people normally read text. Q: Why is it such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? ** Hi Andy, Although I assume you can't start from scratch, I think the article on this topic by the famous Dru Lavigne is very good: http://www.onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html This is what I've used to do it. Now I did a google search and found: http://www.onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html?page=2 And gmirror is in the handbook, if found it in: http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/geom-mirror.html So these sources will give you a lot of knowledge. I swear by gmirror, I had very good experience with it and will use it in the future again. I just need to find some time to attach the two identical HDD's to my via c7 system. Brgds Dino ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Setting up gmirror
Hello, I swear by gmirror, I had very good experience with it and will use it in the future again. I just need to find some time to attach the two identical HDD's to my via c7 system. Actually, you don't need two identical HDD to make a gmirror. It's just important, that the one, you add to the already created array, is not smaller. Some would also argue that having two identical drives makes the array more prone, since they may fail identically. This also happened to me once, and I lost data. Bye, Nejc ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Setting up gmirror
Hi, I've just finished setting up a new web server, and if I get my DNS stuff correct hopefully an e-mail server too, for my church. Originally, the intention was to use RAID1 on the MOBO. However, the RAID controller on the MOBO consistently tried to make the SATA DVD drive part of the RAID array and wouldn't boot the FreeBSD boot disk. So, at the suggestion of another respondent here, I've decided to use gmirror. Now, it seems that gmirror is, perhaps, newer to FreeBSD than the software RAID stuff in the Handbook. That mentions ccd(4) and doesn't make any mention of gmirror(8). It seems like gmirror is rather easy to work with, and more important, easy to recover from is hardware fails. In any event, I want to make sure I'm understanding the manual page correctly because I don't have anything else to test this on except the churches computer. We have two Seagate 250gb SATA drives. Identical drive models so their sizes are the same. Is this the command, from gmirror(8), the one I'll want to use? Create a mirror on disk with valid data (note that the last sector of the disk will be overwritten). Add another disk to this mirror, so it will be synchronized with existing disk: gmirror label -v -b round-robin data da0 gmirror insert data da1 Though in my case, da0 and da1 will be ad4 and ad5. This seems to be the one I'm looking for, I'm just scared of wiping out more than I bargain for. Andy -- A: Because it messes up the order in which people normally read text. Q: Why is it such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
