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Learning Ceph - Second Edition by Karan Singh, Vaibhav Bhembre, Anthony D'Atri

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PG states

We can divide PG states into three categories: Critical, Warning, and Info. PG states in the Critical category indicate severe damage to the cluster and immediate action should be taken to resolve their issues. For example, if we are running out of space on an OSD, we will see the backfill-toofull state being applied. If a PG has lost all OSDs assigned to hold its replicas, then it will be marked as inactive and the client I/O grinds to a halt. PGs in the Warning category indicate that something is wrong with the cluster that needs to be fixed, but there most likely is not major impact to client I/O that would lead to its complete stoppage. PGs in the Info category do not indicate an issue with the cluster, but rather convey routine ...

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