Re: [Luminous 12.2.2] Cluster peformance drops after certain point of time

["shadow_lin"<shadow_lin@xxxxxxx>]

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

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shadow_lin

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发件人：Konstantin Shalygin <k0ste@xxxxxxxx>

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@xxxxxxxxxxxxxx>

抄送："shadow_lin"<shadow_lin@xxxxxxx>

 

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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