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Appendix A. The mClock configuration options
This section contains the list of mClock configuration options:
osd_mclock_profile- Description
It sets the type of mClock profile to use for providing the quality of service (QoS) based on operations belonging to different classes, such as background recovery,
backfill,pg scrub,snap trim,client op, andpg deletion.Once a built-in profile is enabled, the lower-level mClock resource control parameters, that is reservation, weight, and limit, and some Ceph configuration parameters are set transparently. This does not apply for the custom profile.
- Type
- String
- Default
-
balanced - Valid choices
-
balanced,high_recovery_ops,high_client_ops,custom
osd_mclock_max_capacity_iops_hdd- Description
-
It sets a maximum random write IOPS capacity, at 4 KiB block size, to consider per OSD for rotational media. Contributes in QoS calculations when enabling a dmclock profile. It is only considered for
osd_op_queue = mclock_scheduler - Type
- Float
- Default
-
315.0
osd_mclock_max_capacity_iops_ssd- Description
- It sets a maximum random write IOPS capacity, at 4 KiB block size, to consider per OSD for solid state media.
- Type
- Float
- Default
-
21500.0
osd_mclock_cost_per_byte_usec_ssd- Description
-
Indicates cost per byte in microseconds to consider per OSD for SDDs.Contributes in QoS calculations when enabling a dmclock profile. It is only considered for
osd_op_queue = mclock_scheduler - Type
- Float
- Default
-
0.011
osd_mclock_max_sequential_bandwidth_hdd- Description
-
Indicates the maximum sequential bandwidth in bytes to consider for an OSD whose underlying device type is rotational media. This is considered by the mclock scheduler to derive the cost factor to be used in QoS calculations. Only considered for
osd_op_queue = mclock_scheduler - Type
- Size
- Default
-
150_M
osd_mclock_max_sequential_bandwidth_ssd- Description
-
Indicates the maximum sequential bandwidth in bytes to consider for an OSD whose underlying device type is solid state media. This is considered by the mclock scheduler to derive the cost factor to be used in QoS calculations. Only considered for
osd_op_queue = mclock_scheduler - Type
- Size
- Default
-
1200_M
osd_mclock_force_run_benchmark_on_init- Description
- This force-runs the OSD benchmark on OSD initialization or boot-up.
- Type
- Boolean
- Default
- False
- See also
-
osd_mclock_max_capacity_iops_hdd,osd_mclock_max_capacity_iops_ssd
osd_mclock_skip_benchmark- Description
- Setting this option skips the OSD benchmark on OSD initialization or boot-up.
- Type
- Boolean
- Default
- False
- See also
-
osd_mclock_max_capacity_iops_hdd,osd_mclock_max_capacity_iops_ssd
osd_mclock_override_recovery_settings- Description
-
Setting this option enables the override of the recovery or backfill limits for the mClock scheduler as defined by the
osd_recovery_max_active_hdd,osd_recovery_max_active_ssd, andosd_max_backfillsoptions. - Type
- Boolean
- Default
- False
- See also
-
osd_recovery_max_active_hdd,osd_recovery_max_active_ssd,osd_max_backfills
osd_mclock_iops_capacity_threshold_hdd- Description
- It indicates the threshold IOPS capacity, at 4KiB block size, beyond which to ignore the Ceph OSD bench results for an OSD for HDDs.
- Type
- Float
- Default
-
500.0
osd_mclock_iops_capacity_threshold_ssd- Description
- It indicates the threshold IOPS capacity, at 4KiB block size, beyond which to ignore the Ceph OSD bench results for an OSD for SSDs.
- Type
- Float
- Default
-
80000.0
osd_mclock_scheduler_client_res- Description
-
It is the default I/O proportion reserved for each client. The default value of
0specifies the lowest possible reservation. Any value greater than 0 and up to 1.0 specifies the minimum IO proportion to reserve for each client in terms of a fraction of the OSD’s maximum IOPS capacity. - Type
- float
- Default
-
0 - min
- 0
- max
- 1.0
osd_mclock_scheduler_client_wgt- Description
- It is the default I/O share for each client over reservation.
- Type
- Unsigned integer
- Default
-
1
osd_mclock_scheduler_client_lim- Description
-
It is the default I/O limit for each client over reservation. The default value of
0specifies no limit enforcement, which means each client can use the maximum possible IOPS capacity of the OSD. Any value greater than 0 and up to 1.0 specifies the upper IO limit over reservation that each client receives in terms of a fraction of the OSD’s maximum IOPS capacity. - Type
- float
- Default
-
0 - min
- 0
- max
- 1.0
osd_mclock_scheduler_background_recovery_res- Description
- It is the default I/O proportion reserved for background recovery. The default value of 0 specifies the lowest possible reservation. Any value greater than 0 and up to 1.0 specifies the minimum IO proportion to reserve for background recovery operations in terms of a fraction of the OSD’s maximum IOPS capacity.
- Type
- float
- Default
-
0 - min
- 0
- max
- 1.0
osd_mclock_scheduler_background_recovery_wgt- Description
- It indicates the I/O share for each background recovery over reservation.
- Type
- Unsigned integer
- Default
-
1
osd_mclock_scheduler_background_recovery_lim- Description
- It indicates the I/O limit for background recovery over reservation. The default value of 0 specifies no limit enforcement, which means background recovery operation can use the maximum possible IOPS capacity of the OSD. Any value greater than 0 and up to 1.0 specifies the upper IO limit over reservation that background recovery operation receives in terms of a fraction of the OSD’s maximum IOPS capacity.
- Type
- float
- Default
-
0 - min
- 0
- max
- 1.0
osd_mclock_scheduler_background_best_effort_res- Description
-
It indicates the default I/O proportion reserved for background
best_effort. The default value of 0 specifies the lowest possible reservation. Any value greater than 0 and up to 1.0 specifies the minimum IO proportion to reserve for background best_effort operations in terms of a fraction of the OSD’s maximum IOPS capacity. - Type
- float
- Default
-
0 - min
- 0
- max
- 1.0
osd_mclock_scheduler_background_best_effort_wgt- Description
-
It indicates the I/O share for each background
best_effortover reservation. - Type
- Unsigned integer
- Default
-
1
osd_mclock_scheduler_background_best_effort_lim- Description
-
It indicates the I/O limit for background
best_effortover reservation. The default value of 0 specifies no limit enforcement, which means background best_effort operation can use the maximum possible IOPS capacity of the OSD. Any value greater than 0 and up to 1.0 specifies the upper IO limit over reservation that background best_effort operation receives in terms of a fraction of the OSD’s maximum IOPS capacity. - Type
- float
- Default
-
0 - min
- 0
- max
- 1.0
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