Re: Converting from ata-raid to gmirror
- From: "Steve Franks" <stevefranks@xxxxxxxx>
- Date: Mon, 19 Mar 2007 08:52:15 -0700
On 3/18/07, Toomas Aas <toomas.aas@xxxxxxxxxxxxx> wrote:
On January 30th, I wrote:
> I'm currently running FreeBSD 6.2-RELEASE (amd64) on a system based on
> Intel SE7230NH1-E motherboard, which has Intel ICH7R integrated
> softraid. The machine has two 500 GB drives which are configured as
> RAID1 in BIOS. Unfortunately, this setup seems to have some stability
> issues which I can't figure out how to solve. Specifically, when the
> storage subsystem is put under heavy load (such as doing nightly
> backups) the kernel starts spitting out horrible error messages such as:
>
> FAILURE - out of memory in ata_raid_init_request
> g_vfs_done():ar0s1f[WRITE(offset=8091172864, length=16384)]error = 5
> FAIg_vfs_done():ar0LURE - out of memsory in ata_raid_1init_reqfu[eWsRItTE(o
> ffset=8091F1A8I9LU2R4E8 ,- oleuntg tohf= 16m3e8m4o)ry]e rirno ra t=a 5
> _raid_init_requestg
> vfs_done():ar0s1f[WRITE(offsFAeItL=UR8E0 9-1 2o05u6t3 2o,f
> lmeengmtoh=ry1 6i3n8 4a)t]ae_rrraoird _=in i5t
>
> If it looks like garbage, then yes, this is how it appears in
> /var/log/messages. I'm seriously afraid that similar corruption is
> sneaking into important user files.
>
> Only thing I can think of is converting this setup from BIOS-based RAID
> to gmirror. This would involve, I think, modifying /etc/fstab so that it
> references ad4 instead of ar0, then permanently breaking the mirror in
> BIOS, booting up the system with single disk and then basically
> following the gmirror chapter in the handbook. Correct?
>
> I'm also a little uncertain about "permanently breaking the mirror"
> part. I've read all the motherboard and LSI docs I can find and this
> topic isn't covered anywhere.
Well, finally I could summon up enough courage to perform this procedure
on a production server (such as it is). To break the mirror, I just went
to motherboard BIOS (not the BIOS-based RAID utility) and changed the
'Configure SATA as' setting from 'RAID' to 'IDE'. Generally everything
seems to have gone OK. The system now runs from /dev/mirror/gm0, which
consists of ad4 and ad6. However, the kernel still sees the old ar0
array and complains that it's broken. Do I care, or should I just remove
'device ataraid' from kernel configuration?
kernel: ar0: WARNING - mirror protection lost. RAID1 array in DEGRADED mode
kernel: ar0: 476772MB <LSILogic v3 MegaRAID RAID1> status: DEGRADED
kernel: ar0: disk0 READY (master) using ad4 at ata2-master
kernel: ar0: disk1 DOWN no device found for this subdisk
--
Toomas
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I'm just getting into this myself as well, but from previous people
who've helped me, I've come to understand that most motherboard 'raid'
controllers are not tru hardware raid, just a fancy wrapper around
software raid, and they do pretty much exactly the same thing as
gmirror - write a special metadata tag near the end of the disk with
the info on the mirror. This is what ataraid sees that causes it to
find 'ar0' - delete that metadata from the disk, and ar0 will go away.
Possibly there is an extra slice with a couple of blocks at the end
of the disk? That's about the extent of my knowledge...
Steve
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- Re: Converting from ata-raid to gmirror
- From: Toomas Aas
- Re: Converting from ata-raid to gmirror
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