15 Apr
2021
15 Apr
'21
4:52 p.m.
Reading the thread "s3 requires twice the space it should use", Boris pointed
out that the fragmentation for the osds is around 0.8-0.9:
On Thu, Apr 15, 2021 at 8:06 PM Boris Behrens
<bb(a)kervyn.de> wrote:
> I also checked the fragmentation on the bluestore OSDs and it is around
> 0.80 - 0.89 on most OSDs. yikes.
> [root@s3db1 ~]# ceph daemon osd.23 bluestore allocator score block
> {
> "fragmentation_rating": 0.85906054329923576
> }
And that made me wonder what is the current recommended (and not recommended)
way to handle and reduce the fragmentation of the existing OSDs.
Reading around I would think of tweaking the min_alloc_size_{ssd,hdd} and
redeploying those OSDs, but I was unable to find much else, I wonder what do
people do?
ps. There was another thread that got no replies asking something similar (and
a bunch of other things):
https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/message/3PITWZRNX7…