On Tue, Jan 19, 2010 at 02:24:11PM -0800, 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. > > To give an idea of how bad the situation is, iotop from the DTrace > Toolkit occasionally reports single I/O requests to 15k RPM FC disks > that take more than 60 seconds to complete, and even requests to a > SSD drive that take over 10 seconds to complete. It's not uncommon > to open a small text file using vim (or similar editor) and nothing > to pop up for 10-30 seconds. Browsing the web becomes a chore, as > the browser locks up for a few seconds after doing anything. > > I have a full write-up of the situation at > http://www.cs.clemson.edu/~duckwos/zfs-performance/. Any thoughts or > comments are welcome. --
Could your SSD be having problems? Got another to swap in and compare against? Ray _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
