Re: [gentoo-user] IDE RAID 0 and 1
I have some experience with 3ware Promise kernel SW raid Promise: I started with a promise 6000 card and after serious problems with that card I decided to abandon that path. Primarily the card is largely incompatible with the AMD 760 chipset as far as I've been able to conclude. I use dual athlon MP for most customer cluster nodes. Secondarily the serious tech support, while _very_ eager to help are situated in China and, believe it or not, are forbidden to access certain useful websites e.g. the openmosix site. So while we had some very interesting problems trying to smuggle kernel sources back and forth through their bizzaro imposed cencorship I finally got too tired of working with it. 3ware: I've built a 4x120GB raid 5 to serve as main storage for a cluster I built for a customer. It works very nicely. I'm disappointed with the performance, only about 15MB/s. Anyone else got better results? It is well supported in vanilla and openmosix sources. The only problem I've had with this card is that it has dropped single disks twice in 12 months. After replacing and testing I have found nothing wrong with the disks, but I cannot really trust them after being dropped from the raid. Rebuilding is a breeze. Kernel SW raid: One customer wanted a very cheap storage solution for the cluster I built him. So I deployed a 2x120GB raid 1 on kernel SW raid. Very simple setup, very simple management, good general cheap solution. Harebraman Jimmy CSOL research -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
Collins Richey [EMAIL PROTECTED] writes: On Tue, 13 Jan 2004 20:20:40 +0100 Jimmy Rosen [EMAIL PROTECTED] wrote: Kernel SW raid: One customer wanted a very cheap storage solution for the cluster I built him. So I deployed a 2x120GB raid 1 on kernel SW raid. Very simple setup, very simple management, good general cheap solution. How was performance in comparison to the Hardware alternatives? for RAID1, kernel software RAID is just as good as hardware. modern CPUs are a _lot_ more powerful than what you find on the cheap RAID1-cards, and the overhead isn't noticeable. another upside, with software RAID1 you can unplug any of the drives, install it on another system without having to think about RAID controllers and mount the drive. that last part is the reason we chose software RAID1 for the servers that have it here. RAID0 and RAID5 are different beasts though. -- Terje -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Monday 12 January 2004 20:37, Andrew Gaffney wrote: With the kernel software RAID, what would I need to do in order to move an existing system over to the RAID? I have 2 identical 120GB HD's. The second is just backup. I have a script that runs every night and rsync's from HD1 to HD2. I want to move to RAID-1 with minimal system downtime as this is a production server. http://www.tldp.org's software raid howto has instructions on how to do this, and they work! It says it's for RedHat but worked nicely on my 2.6.1 gentoo desktop. I skipped the bits about booting off a rescue cd as I was only doing this on my /home partition. No need to create /dev entries as devfs takes care of that, and haven't bothered changing the partition type, works ok so far, but I haven't yet rebooted. - -- Mike Williams -BEGIN PGP SIGNATURE- Version: GnuPG v1.2.3 (GNU/Linux) iD8DBQFABTe6InuLMrk7bIwRAhIkAKCBKT51vW2c4jOURR2ZTWHMdkT+yACeNnYb eGkRX74MyNhWFLIh6aeN/iI= =7gBk -END PGP SIGNATURE- -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
Mike Williams wrote: On Monday 12 January 2004 20:37, Andrew Gaffney wrote: With the kernel software RAID, what would I need to do in order to move an existing system over to the RAID? I have 2 identical 120GB HD's. The second is just backup. I have a script that runs every night and rsync's from HD1 to HD2. I want to move to RAID-1 with minimal system downtime as this is a production server. http://www.tldp.org's software raid howto has instructions on how to do this, and they work! It says it's for RedHat but worked nicely on my 2.6.1 gentoo desktop. I skipped the bits about booting off a rescue cd as I was only doing this on my /home partition. No need to create /dev entries as devfs takes care of that, and haven't bothered changing the partition type, works ok so far, but I haven't yet rebooted. That's definately good to hear. -- Andrew Gaffney System Administrator Skyline Aeronautics, LLC. 776 North Bell Avenue Chesterfield, MO 63005 636-357-1548 -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
On Wed, 14 Jan 2004 00:43:05 +0200 Sami Näätänen [EMAIL PROTECTED] wrote: PS. I has integrated ide raid which is half HW half SW from ITE. It works well and is quite speedy too. Under normal system load (mp3 listening etc) two ibm 120GB HD's as RAID 1 gives these results. Smaller result from the two consecutive runs. high-voltage /home/sami # hdparm -tT /dev/sda /dev/sda: Timing buffer-cache reads: 2712 MB in 2.00 seconds = 1356.00 MB/sec Timing buffered disk reads: 140 MB in 3.00 seconds = 43.56 MB/sec On my P4P800 system with 3 drives, here are stats 3ware Escalade 7006 card connected to 32 bit PCI 2.2 with 133MB/s max transfer, 2 WD 80GB Caviar drives RAID 1 # hdparm -tT /dev/sda /dev/sda: Timing buffer-cache reads: 2956 MB in 2.00 seconds = 1478.00 MB/sec Timing buffered disk reads: 138 MB in 3.01 seconds = 45.85 MB/sec 80GB WD Caviar single drive connected to IDE on MB: # hdparm -tT /dev/hda /dev/hda: Timing buffer-cache reads: 2908 MB in 2.00 seconds = 1454.00 MB/sec Timing buffered disk reads: 140 MB in 3.02 seconds = 46.36 MB/sec This is a dev machine where I'm not too concerned about performance, and I don't know if these numbers are good or bad (relative to other IDE RAID solutions)...just posting the stats. Not much load when I ran the tests. -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
On Mon, 12 Jan 2004 11:48:38 -0600 Andrew Gaffney [EMAIL PROTECTED] wrote: I'm looking for a decent PCI IDE RAID card that can do hardware RAID 0 and/or 1 under Linux. Can anyone recommend anything? Thanks. I recently installed a 3ware Escalade 7006 card (cheap one $) running RAID 1 in my gentoo system and so far am very pleased with it. I didn't convert my existing HD, I added two new HDs and just moved certain partitions (not the root or boot) to RAID. I stayed away from Adaptec IDE cards because so many other gentooists on the forums had problems with them. -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
HP has a card called a netraid-1 for their netserver product line that does decent hardware raid controlling. -Al At 01:23 PM 1/13/2004 -0500, you wrote: On Mon, 12 Jan 2004 11:48:38 -0600 Andrew Gaffney [EMAIL PROTECTED] wrote: I'm looking for a decent PCI IDE RAID card that can do hardware RAID 0 and/or 1 under Linux. Can anyone recommend anything? Thanks. I recently installed a 3ware Escalade 7006 card (cheap one $) running RAID 1 in my gentoo system and so far am very pleased with it. I didn't convert my existing HD, I added two new HDs and just moved certain partitions (not the root or boot) to RAID. I stayed away from Adaptec IDE cards because so many other gentooists on the forums had problems with them. -- [EMAIL PROTECTED] mailing list -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
I have some experience with the following: 3ware Promise kernel SW raid Promise: I once started with a promise 6000 card and after serious problems with that card I decided to abandon that path. Primarily the card is largely incompatible with the AMD 760 chipset as far as I've been able to conclude. I use dual athlon MP for most customer cluster nodes. Secondarily the serious tech support, while _very_ eager to help are situated in China and, believe it or not, are forbidden to access certain useful websites e.g. the openmosix site. So while we had some very interesting problems trying to smuggle kernel sources back and forth through their bizzaro imposed cencorship I finally got too tired of working with it. 3ware: I've built a 4x120GB raid 5 to serve as main storage for a cluster I built for a customer. It works very nicely. I'm disappointed with the performance, only about 15MB/s. Anyone else got better results? It is well supported in vanilla and openmosix sources. The only problem I've had with this card is that it has dropped single disks twice in 12 months. After replacing and testing I have found nothing wrong with the disks, but I cannot really trust them after being dropped from the raid. Rebuilding is a breeze. Kernel SW raid: One customer wanted a very cheap storage solution for the cluster I built him. So I deployed a 2x120GB raid 1 on kernel SW raid. Very simple setup, very simple management, good general cheap solution. Harebraman Jimmy CSOL research -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
On Mon, 2004-01-12 at 22:57, Alan wrote: On Mon, Jan 12, 2004 at 02:37:53PM -0600, Andrew Gaffney wrote: Ciaran McCreesh wrote: On Mon, 12 Jan 2004 11:48:38 -0600 Andrew Gaffney [EMAIL PROTECTED] wrote: | I'm looking for a decent PCI IDE RAID card that can do hardware RAID 0 | and/or 1 under Linux. Can anyone recommend anything? Thanks. If you *really* want 'IDE RAID', you have to get a 3ware. The promise and highpoint drivers are just silly software hacks. On the other hand, in-kernel md raid is faster for IDE anyway, and doesn't lock you in to a specific vendor. With the kernel software RAID, what would I need to do in order to move an existing system over to the RAID? I have 2 identical 120GB HD's. The second is just backup. I have a script that runs every night and rsync's from HD1 to HD2. I want to move to RAID-1 with minimal system downtime as this is a production server. If you want to move to raid 1 from a single disk there's a bit of a procedure to go through. Hopefully others can add onto this for me, as I've never done it myself (completely anyway). First of all, check the howto: http://www.tldp.org/HOWTO/Software-RAID-HOWTO-7.html#ss7.6 It has one way to do it (redhat specific, but should give you some good pointers that are compatible with gentoo and a liveCD :) Basically what you'll do is set up *one* of the two disks for raid, setting the other as 'failed-disk' in the raidtab. Start up the raid and it'll be running in degraded mode (1/2 disks available). At this point you can copy data across from your real disk. Setup grub or lilo so that your system will boot from /dev/md0 instead of /dev/hda1, then change your fstab to match up. Then you can reboot (I think) and because raid1 is redundant you can leave your old hard drive alone without having to nuke it as you would if you were going to raid5 or raid0. Once things are set up properly and working from the raid disk, you can set the old disk to be integrated into the raid array and then hot-add it in, let it resync (mirror the data) and you're golden. Disclaimer: I haven't done this, never tried it, and quite possibly missed some very important step, so don't hold me responsible for things totally screwing up and destroying everything :) Backup first, etc etc. However, the gist of what is above *should* work :) Hi, I tried the above procedure with raid on loop devices and with User mode linux and it worked... However, the performance was not so good ;-) -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
On Tue, 13 Jan 2004 20:20:40 +0100 Jimmy Rosen [EMAIL PROTECTED] wrote: Kernel SW raid: One customer wanted a very cheap storage solution for the cluster I built him. So I deployed a 2x120GB raid 1 on kernel SW raid. Very simple setup, very simple management, good general cheap solution. How was performance in comparison to the Hardware alternatives? -- Collins - Denver Area Gentoo stable plus kernel 2.6.1-mm2 -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
On Tuesday 13 January 2004 21:20, Jimmy Rosen wrote: I have some experience with the following: 3ware Promise kernel SW raid Promise: I once started with a promise 6000 card and after serious problems with that card I decided to abandon that path. Primarily the card is largely incompatible with the AMD 760 chipset as far as I've been able to conclude. I use dual athlon MP for most customer cluster nodes. Secondarily the serious tech support, while _very_ eager to help are situated in China and, believe it or not, are forbidden to access certain useful websites e.g. the openmosix site. So while we had some very interesting problems trying to smuggle kernel sources back and forth through their bizzaro imposed cencorship I finally got too tired of working with it. 3ware: I've built a 4x120GB raid 5 to serve as main storage for a cluster I built for a customer. It works very nicely. I'm disappointed with the performance, only about 15MB/s. Anyone else got better results? It is The problem most likely is the fact that it used normal PCI bus, which really is not even closely enough for even single disk access. Those 3ware cards are really fast and good when plugged to 64bit PCI-X bus working at 133 MHz speed, but to normal PCI there simply can't be a speedy PCI ide raid, because the PCI bus is too slow. PS. I has integrated ide raid which is half HW half SW from ITE. It works well and is quite speedy too. Under normal system load (mp3 listening etc) two ibm 120GB HD's as RAID 1 gives these results. Smaller result from the two consecutive runs. high-voltage /home/sami # hdparm -tT /dev/sda /dev/sda: Timing buffer-cache reads: 2712 MB in 2.00 seconds = 1356.00 MB/sec Timing buffered disk reads: 140 MB in 3.00 seconds = 43.56 MB/sec -- [EMAIL PROTECTED] mailing list
[gentoo-user] IDE RAID 0 and 1
I'm looking for a decent PCI IDE RAID card that can do hardware RAID 0 and/or 1 under Linux. Can anyone recommend anything? Thanks. -- Andrew Gaffney System Administrator Skyline Aeronautics, LLC. 776 North Bell Avenue Chesterfield, MO 63005 636-357-1548 -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
On Mon, 2004-01-12 at 11:48, Andrew Gaffney wrote: I'm looking for a decent PCI IDE RAID card that can do hardware RAID 0 and/or 1 under Linux. Can anyone recommend anything? Thanks. 3ware http:://www.3ware.com -- Matthew Baxa [EMAIL PROTECTED] http://massachusetts.dce.ksu.edu/~mbaxa/ Applications Services Assistant K-State University Office of Mediated Education http://www.dce.ksu.edu Public key ID: 982330F8 Public key available at: www.keyserver.net signature.asc Description: This is a digitally signed message part
Re: [gentoo-user] IDE RAID 0 and 1
On Mon, 2004-01-12 at 18:48, Andrew Gaffney wrote: I'm looking for a decent PCI IDE RAID card that can do hardware RAID 0 and/or 1 under Linux. Can anyone recommend anything? Thanks. Both the 3Ware and Promise controllers works fine for me under Linux. -- Med venlig hilsen / Best regards, Kim Ingemann http://pingvinland.dk/ signature.asc Description: This is a digitally signed message part
RE: [gentoo-user] IDE RAID 0 and 1
From what I've read, the kernel software RAID for Linux was almost as fast or faster than some IDE RAID Controllers. Something to consider! -Original Message- From: Andrew Gaffney [mailto:[EMAIL PROTECTED] Sent: Monday, January 12, 2004 12:49 PM To: Gentoo User Subject: [gentoo-user] IDE RAID 0 and 1 I'm looking for a decent PCI IDE RAID card that can do hardware RAID 0 and/or 1 under Linux. Can anyone recommend anything? Thanks. -- Andrew Gaffney System Administrator Skyline Aeronautics, LLC. 776 North Bell Avenue Chesterfield, MO 63005 636-357-1548 -- [EMAIL PROTECTED] mailing list -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
Ciaran McCreesh wrote: On Mon, 12 Jan 2004 11:48:38 -0600 Andrew Gaffney [EMAIL PROTECTED] wrote: | I'm looking for a decent PCI IDE RAID card that can do hardware RAID 0 | and/or 1 under Linux. Can anyone recommend anything? Thanks. If you *really* want 'IDE RAID', you have to get a 3ware. The promise and highpoint drivers are just silly software hacks. On the other hand, in-kernel md raid is faster for IDE anyway, and doesn't lock you in to a specific vendor. With the kernel software RAID, what would I need to do in order to move an existing system over to the RAID? I have 2 identical 120GB HD's. The second is just backup. I have a script that runs every night and rsync's from HD1 to HD2. I want to move to RAID-1 with minimal system downtime as this is a production server. -- Andrew Gaffney System Administrator Skyline Aeronautics, LLC. 776 North Bell Avenue Chesterfield, MO 63005 636-357-1548 -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] IDE RAID 0 and 1
On Mon, Jan 12, 2004 at 02:37:53PM -0600, Andrew Gaffney wrote: Ciaran McCreesh wrote: On Mon, 12 Jan 2004 11:48:38 -0600 Andrew Gaffney [EMAIL PROTECTED] wrote: | I'm looking for a decent PCI IDE RAID card that can do hardware RAID 0 | and/or 1 under Linux. Can anyone recommend anything? Thanks. If you *really* want 'IDE RAID', you have to get a 3ware. The promise and highpoint drivers are just silly software hacks. On the other hand, in-kernel md raid is faster for IDE anyway, and doesn't lock you in to a specific vendor. With the kernel software RAID, what would I need to do in order to move an existing system over to the RAID? I have 2 identical 120GB HD's. The second is just backup. I have a script that runs every night and rsync's from HD1 to HD2. I want to move to RAID-1 with minimal system downtime as this is a production server. If you want to move to raid 1 from a single disk there's a bit of a procedure to go through. Hopefully others can add onto this for me, as I've never done it myself (completely anyway). First of all, check the howto: http://www.tldp.org/HOWTO/Software-RAID-HOWTO-7.html#ss7.6 It has one way to do it (redhat specific, but should give you some good pointers that are compatible with gentoo and a liveCD :) Basically what you'll do is set up *one* of the two disks for raid, setting the other as 'failed-disk' in the raidtab. Start up the raid and it'll be running in degraded mode (1/2 disks available). At this point you can copy data across from your real disk. Setup grub or lilo so that your system will boot from /dev/md0 instead of /dev/hda1, then change your fstab to match up. Then you can reboot (I think) and because raid1 is redundant you can leave your old hard drive alone without having to nuke it as you would if you were going to raid5 or raid0. Once things are set up properly and working from the raid disk, you can set the old disk to be integrated into the raid array and then hot-add it in, let it resync (mirror the data) and you're golden. Disclaimer: I haven't done this, never tried it, and quite possibly missed some very important step, so don't hold me responsible for things totally screwing up and destroying everything :) Backup first, etc etc. However, the gist of what is above *should* work :) -- Alan [EMAIL PROTECTED] - http://arcterex.net There are only 3 real sports: bull-fighting, car racing and mountain climbing. All the others are mere games.-- Hemingway -- [EMAIL PROTECTED] mailing list
