[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...


Danti Gionatan
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