On Tue, 24 Mar 2009, Dennis Clarke wrote:
However, I have repeatedly run into problems when I need to boot after a
power failure. I see vdevs being marked as FAULTED regardless if there are
actually any hard errors reported by the on disk SMART Firmware. I am able
to remove these FAULTed devices temporarily and then re-insert the same
disk again and then run fine for months. Until the next long power
failure.
In spite of huge detail, you failed to describe to us the technology
used to communicate with these disks. The interface adaptors,
switches, and wiring topology could make a difference.
Is there *really* a severe fault in that disk ?
# luxadm -v display 21000018625d599d
This sounds some some sort of fiber channel.
Transport protocol: IEEE 1394 (SBP-2)
Interesting that it mentions the protocol used by FireWire.
If you are using fiber channel, the device names in the pool
specification suggest that Solaris multipathing is not being used (I
would expect something long like
c4t600A0B800039C9B500000A9C47B4522Dd0). If multipathing is not used,
then you either have simplex connectivity, or two competing simplex
paths to each device. Multipathing is recommended if you have
redundant paths available.
If the disk itself is not aware of its severe faults then that
suggests that there is a transient problem with communicating with the
disk. The problem could be in a device driver, adaptor card, FC
switch, or cable. If the disk drive also lost power, perhaps the disk
is unusually slow at spinning up.
It is easy to blame ZFS for problems. On my system I was experiencing
system crashes overnight while running 'zfs scrub' via cron job. The
fiber channel card was locking up. Eventually I learned that it was
due to a bug in VirtualBox's device driver. If VirtualBox was not
left running overnight, then the system would not crash.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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