Today I had reason to try the UFS "trim" support on the FreeBSD
version of the Fusion-IO driver,
and I'm pleased to say that it appears to work just fine..
on a 1.3TB flash card..
the numbers of 'sectors' that the drive considers to hold valid data is
reduced after the contents of the drive is erased..:
After newfs -E:
hw.fusion.fio.fio0.data.stats: [...] 861327 [...]
After writing a few GB to the filesystem but BEFORE"rm -r *"
pu05# sysctl hw.fusion.fio.fio0.data.stats
hw.fusion.fio.fio0.data.stats: [...] 3628354 [...]
After"rm -r *"
pu05# sysctl hw.fusion.fio.fio0.data.stats
hw.fusion.fio.fio0.data.stats: [...] 919690 [...]
so from 861,327 packets valid to 3,628,354 packets valid, back to
919,690 packets valid.
(since bitmaps etc are allocated as needed the growth is expected but
will not grow forever).
(yeah I know it never actually reached 1% full but it was a test, ok?)
for flash drives this is great news..
Now if ZFS would get trim support, that too would be great.
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