12 Jan
2011
12 Jan
'11
10:13 p.m.
Marc Perkel put forth on 1/12/2011 12:18 PM:
time sh -c "dd if=/dev/zero of=ddfile bs=8k count=2000000 && sync"
2000000+0 records in 2000000+0 records out 16384000000 bytes (16 GB) copied, 55.403 s, 296 MB/s
real 1m4.738s user 0m0.336s sys 0m20.199s
That's a horrible test case for a mail server, especially one using maildir storage. Streaming read/write b/w results are meaningless for mail I/O. You need a random I/O test such as bonnie++ or iozone to see your IOPS. We already know it'll be off the chart compared to mechanical drives though. Would still be neat to see the numbers. There's also the most realistic test, ironically, given the list on which you asked this question:
http://www.imapwiki.org/Benchmarking
:)
-- Stan