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Date:      Sun, 18 Mar 2007 23:07:36 +0200
From:      Toomas Aas <toomas.aas@raad.tartu.ee>
To:        questions@freebsd.org
Subject:   Re: Converting from ata-raid to gmirror
Message-ID:  <45FDAA18.1080203@raad.tartu.ee>
In-Reply-To: <45BFB6A1.9080200@raad.tartu.ee>
References:  <45BFB6A1.9080200@raad.tartu.ee>

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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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