On 10/23/09 16:56, sean walmsley wrote:
Eric and Richard - thanks for your responses.
I tried both:
echo ::spa -c | mcb
zdb -C (not much of a man page for this one!)
and was able to match the POOL id from the log (hex 4fcdc2c9d60a5810) with both
outputs. As Richard pointed out, I needed to convert the hex value to decimal
to get a match with the zdb output.
In neither case, however, was I able to get a match with the disk vdev id from
the fmdump output.
It turns out that a disk in this machine was replaced about a month ago, and
sure enough the vdev that was complaining at the time was the 0x179e471c0732582
vdev that is now missing.
What's confusing is that the fmd message I posted about is dated Oct 22 whereas the
original error and replacement happened back in September. An "fmadm faulty" on
the machine currently doesn't return any issues.
That message indicates that a previous problem was repaired, not a new
diagnosis.
After physically replacing the bad drive and issuing the "zpool replace" command, I think that we probably issued
the "fmadm repair <uuid>" command in line with what Sun has asked us to do in the past. In our experience, if
you don't do this then fmd will re-issue duplicate complaints regarding hardware failures after every reboot until you do. In
this case, perhaps a "repair" wasn't really the appropriate command since we actually replaced the drive. Would a
"fmadm flush" have been better? Perhaps a clean reboot is in order?
So, it looks like the root problem here is that fmd is confused rather than
there being a real issue with ZFS. Despite this, we're happy to know that we
can now match vdevs against physical devices using either the mdb trick or zdb.
This is fixed in build 127 via:
6889827 ZFS retire agent needs to do a better job of staying in sync
We've followed Eric's work on ZFS device enumeration for the Fishwork project
with great interest - hopefully this will eventually get extended to the fmdump
output as suggested.
Yep, we're working on it ;-)
- Eric
--
Eric Schrock, Fishworks http://blogs.sun.com/eschrock
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