Hi Matthew,
I'm running 7.2-RELEASE-p4 on an i386 HP server (ML G5) in RAID1
configuration. Very recently, I've seen IO errors such as:
ad0: TIMEOUT - READ_DMA retrying (1 retry left) LBA=20472527
reported and the RAID mirror is now offline.
ad0: TIMEOUT - WRITE_DMA48 retrying (1 retry left) LBA=395032335
ad0: FAILURE - WRITE_DMA48 status=51<READY,DSC,ERROR>
error=10<NID_NOT_FOUND> LBA=395032335
ar0: WARNING - mirror protection lost. RAID1 array in DEGRADED mode
I had more or less the same timeout issues on my 8.0-RELEASE box on a
Dell R300 with SATA disks. What I did was raise the ata timeout from 5
seconds to 20. I did this by patching the kernel code while running, but
I'm not sure you'd like that approach ;)
In http://www.freebsd.org/cgi/query-pr.cgi?pr=111023 a patch is
presented that raises the timeouts by patching a few ATA kernel source
files. This has been committed to RELENG_7 as well, so by upgrading your
7.2-install to the latest RELENG_7 (or RELENG_8), you'll have that
timeout fix.
Why ATA commands can take longer than 5 seconds although the disks
appear to be fine.. wouldn't know ..
--
Pieter
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