write cache was enabled on all the ZFS drives, but disabling it gave a negligible speed improvement: (FWIW, the pool has 50 drives)
(write cache on) /bin/time tar xf /tmp/vbulletin_3-6-4.tar real 51.6 user 0.0 sys 1.0 (write cache off) /bin/time tar xf /tmp/vbulletin_3-6-4.tar real 49.2 user 0.0 sys 1.0 ...this is a production system, so I attribute the 2-second (4%) difference more to variable system activity than to the write cache. I suppose I could test with larger samples, but since this is still ten times slower than I want, I think this effectively discounts the disk write cache as anything significant. This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
