Re: Current min_alloc_size of OSD?

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On 11.01.23 23:47, Anthony D'Atri wrote:

It’s printed in the OSD log at startup.

But which info is it exactly?

This line looks like reporting the block_size of the device:

  bdev(0x55b50a2e5800 /var/lib/ceph/osd/ceph-0/block) open size 107369988096 (0x18ffc00000, 100 GiB) block_size 4096 (4 KiB) non-rotational discard supported

Is it this line?

  bluefs _init_alloc shared, id 1, capacity 0x18ffc00000, block size 0x10000

  0x10000 equals 65536 aka 64K in decimal.

Is it this line?

  bluestore(/var/lib/ceph/osd/ceph-0) _open_super_meta min_alloc_size 0x1000

Or this one?

  bluestore(/var/lib/ceph/osd/ceph-0) _init_alloc loaded 100 GiB in 1 extents, allocator type hybrid, capacity 0x18ffc00000, block size 0x1000, free 0x18ffbfd000, fragmentation 0

I don’t immediately see it in `ceph osd metadata` ; arguably it should be there.

An entry in ceph osd metadata would be great to have.

`config show` on the admin socket I suspect does not show the existing value.

This show the value currently set in the configuration.

Regards
--
Robert Sander
Heinlein Consulting GmbH
Schwedter Str. 8/9b, 10119 Berlin

https://www.heinlein-support.de

Tel: 030 / 405051-43
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