I would like to RAID my system but am wondering if I am
asking for trouble,
given that I got some kind of read failure error followed by
file system
corruption the first time I did it. Would it be reasonable
for me to try
RAIDing again, and if so, under what conditions? Details are
as follows:
I moved my home FreeBSD 6.0 system, which had previously
been on a single IDE
drive, onto two SATA drives (set to 3.0 G) in a RAID-1
array, with hardware
raid (Nvidia) on the motherboard (ASUS A8N-E). I used dump
as instructed in
the FreeBSD FAQ. This went okay.
I then installed a third, large (400GB) SATA drive and
backed up the system on
the RAID (minus /proc, /tmp, and so on) to it using
rdiff-backup. This seemed
to go OK.
Then, when I shut down immediately afterwards, I saw this:
Feb 27 08:43:19 bsd kernel: ad8: FAILURE - READ_DMA
status=51<READY,DSC,ERROR>
error=40<UNCORRECTABLE> LBA=146193935
Feb 27 08:43:19 bsd kernel: ar0: WARNING - mirror protection
lost. RAID1 array
in DEGRADED mode
Feb 27 08:43:19 bsd kernel: ar0: writing of nVidia
MediaShield metadata is NOT
supported yet
I rebooted, the message from the bios that the RAID was
healthy came up, but
FreeBSD said the file system was not healthy, and I had to
run fsck about
five times for it to come up clean. The system booted to
desktop, crashed
after about ten seconds, rebooted, and turned up with a
dirty filesytem
again.
I have since dismantled RAID, removed one of the SATA
drives, fsck'ed
repeatedly, and then reinstalled KDE, figuring that that as
it only crashed
when it had finished loading the desktop, that something
might be amiss
there. The system is running again.
All the drives are brand new, as is the cabling. The drives
show up in
messages as "SATA150" (is 3.0G not supported in
FreeBSD?), although the board
supports 3.0G transfer rates. There is an errata sheet in
the motherboard
manual with a matrix indicating on which drive, given
multiple SATA drives,
the OS should be installed. It's silent on why this is
advised and on the
subject of the proper order if RAID is involved. Extended
offline SMART test
on the current drive with smartctl completed without error
and overall-health
self-assessment test result: PASSED. Thanks in advance for
any advice.
Oliver
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