> -----Original Message-----
> From: owner-freebsd-questions freebsd.org
[mailto:owner-freebsd-
> questionsfreebsd.org] On Behalf Of Oliver Iberien
> Sent: Thursday, 1 March 2007 10:02 AM
> To: freebsd-questionsfreebsd.org
> Subject: RAID failure with READ_DMA status=51 - how to
avoid again?
>
> 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
I would suggest downloading FreeSBIE, booting from it and
running a dd
on your drives to see if it picks up any bad sectors:
dd if=/dev/adN of=/dev/null bs=1m conv=noerror
Regards,
Russell Wood
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