Date: Sat, 28 Jun 2008 16:51:25 -0500
From: Derek Ragona <derek@computinginnovations.com>
To: "Garrett Cooper" <yanefbsd@gmail.com>, =?iso-8859-1?Q?=22S=F8ren_Schmidt=22?= <sos@freebsd.org>, ed@80386.nl
Cc: current@freebsd.org
Subject: Re: {Spam?} Re: URGENT: Need help rebuilding iir RAID5 array with failed drive
Message-ID: <6.0.0.22.2.20080628164840.025cbaf0@mail.computinginnovations.com>
In-Reply-To: <7d6fde3d0806281410r781a6a77k98ffe237c10e3eee@mail.gmail.co m>
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At 04:10 PM 6/28/2008, Garrett Cooper wrote: >On Sat, Jun 28, 2008 at 11:30 AM, Derek Ragona ><derek@computinginnovations.com> wrote: > > At 05:49 AM 6/28/2008, you wrote: > > > > On Sat, Jun 28, 2008 at 2:02 AM, S=F8ren Schmidt <sos@freebsd.org> wrot= e: > >> > >> Erm, this makes no sense at all. You state you use the "iir" driver for > >> the > >> card, yet you expect to see the devices under ATA ? Those are two very > >> different animals, you can't use them together in away way or fashion = on > >> the > >> same drives. > >> > >> That asks the question: which one is it ? > >> > >> If you use "iir" I have no idea how/if a rebuild is possible under > >> FreeBSD, > >> however it could be in the BIOS or with any other OS that supports it > >> (here > >> the HW should have kept your parity data intact). > >> > >> If you use ATA you shouldn't have used RAID5 as the docs tell you, as > >> there > >> will be no parity data to rebuild from no matter what BIOS/OS you use = -> > >> you > >> will get garbage no matter what. > > > > Uhm... ok, I'll bite. What documentation states how to use RAID's > > under FreeBSD properly? The GEOM docs didn't seem to be what I was > > looking for back then. > > > >>> Thanks for the help and support. This definitely served as a lesson to > >>> backup my data more often... > >> > >> That by itself may be worth all the trouble :) > > > > No doubt. > > > > Thanks :), > > -Garrett > > > > You can either use the built in RAID software in FreeBSD or use the=20 > hardware > > makers RAID outside FreeBSD. > > > > If you use the internal FreeBSD for a software RAID, most recommend you= use > > the RAID for non-boot, using a separate disk to boot from. Basically u= sing > > a smaller drive for / so the system is bootable and configurable with or > > without RAID. Then add your RAID after installing FreeBSD. > > > > If you choose to just setup a RAID array in the hardware, then usually > > FreeBSD just see this volume as one large single drive you can=20 > partition and > > use like one huge virtual disk. In the case of errors or failures you = need > > to check the console logs when the system boots. I wouldn't recommend = this > > method UNLESS you do RAID 10 with hot spare drives. So any drive failu= res > > are rebuilt for you, so errors on reboots will still need to be=20 > checked, but > > just to see if a drive needs to be replaced. > > > > Depending on the systems use, you may find it easier to use one of the > > "packaged" solutions based on FreeBSD, such as: > > www.freenas.org > > or > > http://m0n0.ch/wall/ > >Thanks for the comments Derek, Soren, and Ed. > >FWIW (I've discovered this through personal experience and reading a >lot of docs), the only way to get "hardware RAID" with iir and the >ICH9R chipset is through the Matrix Manager (either by creating one at >the BIOS level console or Windows -- bleh). FreeBSD spotted it as a >single drive (/dev/ar0), so at that point it was being managed by the >southbridge. > >Performance sucks, the array rebuild takes eons (16 hours for adding a >1TB drive to an existing 4 x 750GB drive array with an Core 2 E6700 >with 2GB RAM under Vista x64) and the rebuild console is _only_ >available under Windows =3D(. > >At least it's keeping the filesystem intact though, long enough for me >to make a redundant copy of the data then move all this junk over to >another safe place while I grab DVD+R/W's and wait for my 3ware card >to come in the mail.. > >Thanks, >-Garrett > >-- Garrett, There is a setting in the matrix manager on some versions to set the=20 rebuild rate. It defaults to a low value like 30% so the array rebuild can= =20 take place with the OS still running and usable. If the system is really= =20 doing nothing else, bump that value to 90-100%, it will rebuild MUCH faster= =20 then. -Derek --=20 This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.
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