I disabled file prefetch and there was no effect. Here are some performance numbers. Note that, when the application server used a ZFS file system to save its data, the transaction took TWICE as long. For some reason, though, iostat is showing 5x as much disk writing (to the physical disks) on the ZFS partition. Can anyone see a problem here?
----- Average application server client response time (1st run/2nd run): SVM - 12/18 seconds ZFS - 35/38 seconds SVM Performance --------------- # iostat -xnz 5 extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 195.1 414.3 1465.9 1657.3 0.0 1.7 0.0 2.7 0 98 md/d100 97.5 414.3 730.2 1657.3 0.0 1.0 0.0 1.9 0 74 md/d101 97.7 414.1 735.8 1656.5 0.0 0.8 0.0 1.5 0 59 md/d102 54.4 203.6 370.7 814.2 0.0 0.5 0.0 2.1 0 42 c0t2d0 52.8 210.6 359.5 842.2 0.0 0.5 0.0 1.9 0 40 c0t3d0 54.0 203.6 374.7 814.2 0.0 0.3 0.0 1.2 0 26 c0t4d0 52.2 210.6 361.1 842.2 0.0 0.5 0.0 1.8 0 38 c0t5d0 ZFS Performance --------------- # iostat -xnz 5 extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 23.2 148.8 1496.7 3806.8 0.0 2.5 0.0 14.7 0 21 c0t2d0 22.8 148.8 1470.9 3806.8 0.0 2.4 0.0 13.9 0 22 c0t3d0 24.2 149.0 1561.1 3805.0 0.0 1.5 0.0 8.6 0 18 c0t4d0 23.4 149.4 1509.6 3805.0 0.0 2.5 0.0 14.7 0 25 c0t5d0 # zpool iostat 5 capacity operations bandwidth pool used avail read write read write ---------- ----- ----- ----- ----- ----- ----- pool1 5.69G 266G 12 243 775K 7.20M pool1 5.69G 266G 88 232 5.53M 7.12M pool1 5.69G 266G 78 216 4.87M 6.81M This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss