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Appendix D. Ceph File System mirrors configuration reference

This section lists configuration options for Ceph File System (CephFS) mirrors.

cephfs_mirror_max_concurrent_directory_syncs
Description
Maximum number of directory snapshots that can be synchronized concurrently by cephfs-mirror daemon. Controls the number of synchronization threads.
Type
Integer
Default
3
Min
1
cephfs_mirror_action_update_interval
Description
Interval in seconds to process pending mirror update actions.
Type
secs
Default
2
Min
1
cephfs_mirror_restart_mirror_on_blocklist_interval
Description
Interval in seconds to restart blocklisted mirror instances. Setting to zero (0) disables restarting blocklisted instances.
Type
secs
Default
30
Min
0
cephfs_mirror_max_snapshot_sync_per_cycle
Description
Maximum number of snapshots to mirror when a directory is picked up for mirroring by worker threads.
Type
Integer
Default
3
Min
1
cephfs_mirror_directory_scan_interval
Description
Interval in seconds to scan configured directories for snapshot mirroring.
Type
Integer
Default
10
Min
1
cephfs_mirror_max_consecutive_failures_per_directory
Description
Number of consecutive snapshot synchronization failures to mark a directory as “failed”. Failed directories are retried for synchronization less frequently.
Type
Integer
Default
10
Min
0
cephfs_mirror_retry_failed_directories_interval
Description
Interval in seconds to retry synchronization for failed directories.
Type
Integer
Default
60
Min
1
cephfs_mirror_restart_mirror_on_failure_interval
Description
Interval in seconds to restart failed mirror instances. Setting to zero (0) disables restarting failed mirror instances.
Type
secs
Default
20
Min
0
cephfs_mirror_mount_timeout
Description
Timeout in seconds for mounting primary or secondary CephFS by the cephfs-mirror daemon. Setting this to a higher value could result in the mirror daemon getting stalled when mounting a file system if the cluster is not reachable. This option is used to override the usual client_mount_timeout.
Type
secs
Default
10
Min
0
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