On Tue, 19 Jan 2010, Scott Duckworth wrote:
[Cross-posting to ldoms-discuss]
We are occasionally seeing massive time-to-completions for I/O
requests on ZFS file systems on a Sun T5220 attached to a Sun
StorageTek 2540 and a Sun J4200, and using a SSD drive as a ZIL
device. Primary access to this system is via NFS, and with NFS
COMMITs blocking until the request has been sent to disk,
performance has been deplorable. The NFS server is a LDOM domain on
the T5220.
What is the output of 'zpool status' for this pool? What is the
output of 'iostat -xe'?
Have you verified that your StorageTek 2540 firmware is up to date?
BTFW that new firmware comes with new CAM software, which does not
seem to be announced in any useful fashion so you won't know about it
unless you poll the Sun Downloads site. I have not seen any stalling
problems with my StorageTek 2540 here.
I agree with Ray Van Dolson that the evidence supplied thus far points
to an issue with the SSD. Perhaps the system is noticing a problem
and is continually resetting it. Check for messages in
/var/adm/messages.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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