David Wragg wrote:
I've not done anything different this time from when I created the original
(512b) pool. How would I check ashift?
For a zpool called "export"...
# zdb export | grep ashift
As far as I know (although I don't have any WD's), all the current 4k
sectorsize hard drives claim to be 512b sectorsize, so if you didn't do
anything special, you'll probably have ashift=9.
I would look at a zpool iostat -v to see what the IOPS rate is (you may
have bottomed out on that), and I would also work out average transfer
size (although that alone doesn't necessarily tell you much - a dtrace
quantize aggregation would be better). Also check service times on the
disks (iostat) to see if there's one which is significantly worse and
might be going bad.
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