Hi,
I'm currently chewing on an issue regarding "slow requests are blocked". I'd like to identify the OSD that is causing those events
once the cluster is back to HEALTH_OK (as I have no monitoring yet that would get this info in realtime).
Collecting this information could help identify aging disks if you were able to accumulate and analyze which OSD had blocking
requests in the past and how often those events occur.
My research so far let's me think that this information is only available as long as the requests are actually blocked. Is this
correct?
You don't give any indication what version you are running but see
https://tracker.ceph.com/issues/23205
the cluster is an Proxmox installation which is based on an Ubuntu kernel.
# ceph -v
ceph version 12.2.5 (dfcb7b53b2e4fcd2a5af0240d4975adc711ab96e) luminous (stable)
The mistery is that these blocked requests occur numerously when at least one of the 6 servers is booted with kernel
4.15.17, if all are running 4.13.16 the number of blocked requests is infrequent and low.
Regards,
Uwe
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