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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