18장. Setting Ceph OSD full thresholds

You can set Ceph OSD full thresholds temporarily by using the ODF CLI tool. This is necessary in cases when the cluster gets into a full state and the thresholds need to be immediately increased.

full

This subcommand allows updating the Ceph OSD full ratio in case Ceph prevents the IO operation on OSDs that reached the specified capacity. The default is 0.85.

For example, set Ceph OSD full ratio to 0.9 and then add capacity:

$ odf set full 0.9

For instructions to add capacity for you specific use case, see the Scaling storage guide.

If OSDs continue to be in stuck, pending, or do not come up at all:

backfillfull

This subcommand allows updating the Ceph OSDd backfillfull ratio in case Ceph denies backfilling to the OSD that reached the capacity specified. The default value is 0.80.

For example, to set backfillfull to 0.85:

$ odf set backfillfull 0.85

nearfull

This subcommand allows updating the Ceph OSD nearfull ratio in case Ceph returns the nearfull OSDs message when the cluster reaches the capacity specified. The default value is 0.75.

For example, to set nearfull to 0.8:

$ odf set nearfull 0.8