[linux-lvm] Why is the performance of my lvmthin snapshot so poor
Gionatan Danti
g.danti at assyoma.it
Wed Jun 15 09:34:00 UTC 2022
Il 2022-06-15 09:42 Zhiyong Ye ha scritto:
> I regenerated the thin volume with the chunksize of 64K and the random
> write performance data tested with fio 64k requests is as follows:
> case iops
> thin lv 9381
> snapshotted thin lv 8307
As expected, increasing I/O size (to avoid r/m/w) greatly reduced the
issue (the ~11% hit is due to metadata allocation overhead).
I don't see anything wrong, so I think you had to live with the
previously recorded 10x performance hit when overwriting 4K blocks on a
64K chunk size thin volume...
Regards.
--
Danti Gionatan
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