Bluestore with so many small files

[Behnam Loghmani <behnam.loghmani@xxxxxxxxx>]

Hi there,

I am using ceph Luminous 12.2.2 with:

3 osds (each osd is 100G) - no WAL/DB separation.

3 mons

1 rgw

cluster size 3

I stored lots of thumbnails with very small size on ceph with radosgw.

Actual size of files is something about 32G but it filled 70G of each osd.

what's the reason of this high disk usage?

should I change "bluestore_min_alloc_size_hdd"? and If I change it and set it to smaller size, does it impact on performance?

what is the best practice for storing small files on bluestore?

Best regards,

Behnam Loghmani

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