Thanks for the information, but I think that is not my case because I am using
only hdd in my cluster.
From the command you provide I found the db_used_bytes is quite large, but I am
not sure how the db used bytes is related to the amount of stored data and the
performance.
ceph daemon osd.0 perf dump | jq '.bluefs' | grep -E '(db|slow)'
"db_total_bytes": 400029646848,
"db_used_bytes": 9347006464,
"slow_total_bytes": 0,
"slow_used_bytes": 0
2017-12-18
shadow_lin
发件人：Konstantin Shalygin <k0...@k0ste.ru>
发送时间：2017-12-18 13:52
主题：Re: [ceph-users] [Luminous 12.2.2] Cluster peformance drops after certain
point of time
收件人："ceph-users"<ceph-users@lists.ceph.com>
抄送："shadow_lin"<shadow_...@163.com>
I am testing luminous 12.2.2 and find a strange behavior of my cluster.
Check your block.db usage. Luminous 12.2.2 is affected
http://tracker.ceph.com/issues/22264
[root@ceph-osd0]# ceph daemon osd.46 perf dump | jq '.bluefs' | grep -E
'(db|slow)'
"db_total_bytes": 30064762880,
"db_used_bytes": 16777216,
"slow_total_bytes": 240043163648,
"slow_used_bytes": 659554304,
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