Hi,
on a OmniosCE r151022 system we have rebuild our zfs pool. The pool is
constructed out of 18 mirror vdevs, each consisting of 2 1,8TB SAS
drives. Since about half the disks are 512b and the other half are 512e
(physical 4k) we opted to use 4k sectors using sd.conf for all devices;
thus all vdevs report as ashift 12. During testing today we experienced
extremely poor read performance. Doing sequential reads with dd of the
pool results in a read rate of 300MB/s, benchmarking with bonnie++ gives
about 600MB/s
Write performance is as expected, around 1,4GB/s.
Scrub also performs as expected, zpool status shows a scrub speed of
2GB/s, iostat -x shows a total pool speed of 4GB/s.
Any hints as to what might be causing our poor read performance?
Sincerely,
Gijs Peskens
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