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
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