Anantha N. Srirama wrote:
I'm experiencing a bizzare write performance problem while using a
ZFS filesystem. Here are the relevant facts:
[b]No error messages listed by zpool or /var/opt/messages.[/b] When I
try to save a file the operation takes an inordinate amount of time,
in the 30+ second range!!! I truss'd the vi session to see the hangup
and it waits at the write system call.
This problem manifests itself only on this filesystem and not on the
other ZFS filesystems on the same server built from the same ZFS
pool. While I was awaiting completion of the above write I was able
to start a new vi session in another window and saved a file to the
/u001 filesystem without any problem. System loads are very low. Can
anybody comment on this bizzare behavior?
Wow, you're right, that is really bizarre! If you're familiar with mdb,
could you get a kernel stack trace of that process? Or if not, take a
crash dump while it is hung and send it to us? Are there any
interesting messages printed to the console (eg. SCSI reset timeouts)?
If you do an administrative command (eg. 'zfs set') while the write is
"hung", does it take a long time too? Can you send us the output of
'zpool status', so we can see if there are any I/O errors?
--matt
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