I'm running OSX ElCapitan and created a ZFS pool on an external USB3.0 drive. But somehow it became very slow. I don't need that drive to be really fast, I know that ZFS is not designed to be fast, but to be safe - but it wasn't that slow before my OSX update, I think.
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$ zpool iostot
capacity operations bandwidth
pool alloc free read write read write
---------- ----- ----- ----- ----- ----- -----
extpool 819G 109G 122 52 11.3M 4.39M
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$ zpool status
pool: extpool
state: ONLINE
scan: scrub repaired 0 in 68h10m with 0 errors on Mon Oct 12 19:31:24 2015
config:
NAME STATE READ WRITE CKSUM
extpool ONLINE 0 0 0
media-D152463E-B753-4C01-9B27-5F738F28274B ONLINE 0 0 0
errors: No known data errors
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$ zpool get all extpool
NAME PROPERTY VALUE SOURCE
extpool size 928G -
extpool capacity 88% -
extpool altroot - default
extpool health ONLINE -
extpool guid 16673695283323271852 default
extpool version - default
extpool bootfs - default
extpool delegation on default
extpool autoreplace off default
extpool cachefile - default
extpool failmode wait default
extpool listsnapshots off default
extpool autoexpand off default
extpool dedupditto 0 default
extpool dedupratio 1.00x -
extpool free 106G -
extpool allocated 822G -
extpool readonly off -
extpool ashift 0 default
extpool comment - default
extpool expandsize - -
extpool freeing 0 default
extpool fragmentation 33% -
extpool leaked 0 default
extpool feature@async_destroy enabled local
extpool feature@empty_bpobj enabled local
extpool feature@lz4_compress active local
extpool feature@spacemap_histogram active local
extpool feature@enabled_txg active local
extpool feature@hole_birth active local
extpool feature@extensible_dataset enabled local
extpool feature@embedded_data active local
extpool feature@bookmarks enabled local
extpool feature@filesystem_limits enabled local
extpool feature@large_blocks enabled local
Is there anything to speed this up, or are these speeds normal?
Best, Sebastian
P.S.: I just realised that I have a quite high fragmentation and my pool is relatively full - could this explain my significant performance drop?