on the strength of observations made by somebody else here recently, i tried
moving my mail store from ZFS to UFS.
scan results for +inbox, ~4000 messages.
UFS (3Ware mirror):
0.114u 0.076s 0:00.21 85.7% 138+1461k 1+0io 0pf+0w
0.110u 0.081s 0:00.21 90.4% 147+1429k 0+0io 0pf+0w
0.125u 0.066s 0:00.19 94.7% 144+1519k 0+0io 0pf+0w
ZFS (raidz2):
0.440u 1.273s 0:33.47 5.1% 143+1507k 0+0io 0pf+0w
0.369u 1.369s 0:34.00 5.0% 131+1377k 0+0io 0pf+0w
0.347u 1.383s 0:33.91 5.0% 147+1553k 0+0io 0pf+0w
my sleepycat version is no faster than the UFS numbers above. apparently i
have been the victim of "zfs fragmentation". i'm going to back off of trying
to put the full headers into the sleepycat and just focus on IMAP's UID's now.
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