It is highly likely you are seeing a duplicate of:
6413510 zfs: writing to ZFS filesystem slows down fsync() on
other files in the same FS
which was fixed recently in build 48 on Nevada.
The symptoms are very similar. That is a fsync from the vi would, prior
to the bug being fixed, have to force out all other data through the
intent log.
Neil.
Anantha N. Srirama wrote On 09/13/06 15:58,:
One more piece of information. I was able to ascertain the slowdown happens only when ZFS is used heavily; meaning lots of inflight I/O. This morning when the system was quiet my writes to the /u099 filesystem was excellent and it has gone south like I reported earlier.
I am currently awaiting the completion of a write to /u099, well over 60
seconds. At the same time I was able create/save files in /u001 without any
problems. The only difference between the /u001 and /u099 is the size of the
filesystem (256GB vs 768GB).
Per your suggestion I ran a 'zfs set' command and it completed after a wait of
around 20 seconds while my file save from vi against /u099 is still pending!!!
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