the max OSD capacity provided beforehand. As a result, the following mclock
config parameters cannot be modified when using any of the built-in profiles:
-- ``osd_mclock_scheduler_client_res``
-- ``osd_mclock_scheduler_client_wgt``
-- ``osd_mclock_scheduler_client_lim``
-- ``osd_mclock_scheduler_background_recovery_res``
-- ``osd_mclock_scheduler_background_recovery_wgt``
-- ``osd_mclock_scheduler_background_recovery_lim``
-- ``osd_mclock_scheduler_background_best_effort_res``
-- ``osd_mclock_scheduler_background_best_effort_wgt``
-- ``osd_mclock_scheduler_background_best_effort_lim``
+- :confval:`osd_mclock_scheduler_client_res`
+- :confval:`osd_mclock_scheduler_client_wgt`
+- :confval:`osd_mclock_scheduler_client_lim`
+- :confval:`osd_mclock_scheduler_background_recovery_res`
+- :confval:`osd_mclock_scheduler_background_recovery_wgt`
+- :confval:`osd_mclock_scheduler_background_recovery_lim`
+- :confval:`osd_mclock_scheduler_background_best_effort_res`
+- :confval:`osd_mclock_scheduler_background_best_effort_wgt`
+- :confval:`osd_mclock_scheduler_background_best_effort_lim`
The following Ceph options will not be modifiable by the user:
-- ``osd_max_backfills``
-- ``osd_recovery_max_active``
+- :confval:`osd_max_backfills`
+- :confval:`osd_recovery_max_active`
This is because the above options are internally modified by the mclock
scheduler in order to maximize the impact of the set profile.
If any mClock profile (including "custom") is active, the following Ceph config
sleep options will be disabled,
-- ``osd_recovery_sleep``
-- ``osd_recovery_sleep_hdd``
-- ``osd_recovery_sleep_ssd``
-- ``osd_recovery_sleep_hybrid``
-- ``osd_scrub_sleep``
-- ``osd_delete_sleep``
-- ``osd_delete_sleep_hdd``
-- ``osd_delete_sleep_ssd``
-- ``osd_delete_sleep_hybrid``
-- ``osd_snap_trim_sleep``
-- ``osd_snap_trim_sleep_hdd``
-- ``osd_snap_trim_sleep_ssd``
-- ``osd_snap_trim_sleep_hybrid``
+- :confval:`osd_recovery_sleep`
+- :confval:`osd_recovery_sleep_hdd`
+- :confval:`osd_recovery_sleep_ssd`
+- :confval:`osd_recovery_sleep_hybrid`
+- :confval:`osd_scrub_sleep`
+- :confval:`osd_delete_sleep`
+- :confval:`osd_delete_sleep_hdd`
+- :confval:`osd_delete_sleep_ssd`
+- :confval:`osd_delete_sleep_hybrid`
+- :confval:`osd_snap_trim_sleep`
+- :confval:`osd_snap_trim_sleep_hdd`
+- :confval:`osd_snap_trim_sleep_ssd`
+- :confval:`osd_snap_trim_sleep_hybrid`
The above sleep options are disabled to ensure that mclock scheduler is able to
determine when to pick the next op from its operation queue and transfer it to
*high_recovery_ops*.
If there is a requirement to change the default profile, then the option
-``osd_mclock_profile`` may be set during runtime by using the following
+:confval:`osd_mclock_profile` may be set during runtime by using the following
command:
.. prompt:: bash #
:Bluestore Throttle Parameters:
We recommend using the default values as defined by
- ``bluestore_throttle_bytes`` and ``bluestore_throttle_deferred_bytes``. But
- these parameters may also be determined during the benchmarking phase as
- described below.
-
+ :confval:`bluestore_throttle_bytes` and
+ :confval:`bluestore_throttle_deferred_bytes`. But these parameters may also be
+ determined during the benchmarking phase as described below.
OSD Bench Command Syntax
````````````````````````
command. This value is the baseline throughput(IOPS) when the default
bluestore throttle options are in effect.
#. If the intent is to determine the bluestore throttle values for your
- environment, then set the two options, ``bluestore_throttle_bytes``
- and ``bluestore_throttle_deferred_bytes`` to 32 KiB(32768 Bytes) each
+ environment, then set the two options, :confval:`bluestore_throttle_bytes`
+ and :confval:`bluestore_throttle_deferred_bytes` to 32 KiB(32768 Bytes) each
to begin with. Otherwise, you may skip to the next section.
#. Run the 4KiB random write test as before using OSD bench.
#. Note the overall throughput from the output and compare the value
mClock Config Options
=====================
-``osd_mclock_profile``
-
-:Description: This sets the type of mclock profile to use for providing QoS
- based on operations belonging to different classes (background
- recovery, scrub, snaptrim, client op, osd subop). Once a built-in
- profile is enabled, the lower level mclock resource control
- parameters [*reservation, weight, limit*] and some Ceph
- configuration parameters are set transparently. Note that the
- above does not apply for the *custom* profile.
-
-:Type: String
-:Valid Choices: high_client_ops, high_recovery_ops, balanced, custom
-:Default: ``high_client_ops``
-
-``osd_mclock_max_capacity_iops_hdd``
-
-:Description: Max IOPS capacity (at 4KiB block size) to consider per OSD (for
- rotational media)
-
-:Type: Float
-:Default: ``315.0``
-
-``osd_mclock_max_capacity_iops_ssd``
-
-:Description: Max IOPS capacity (at 4KiB block size) to consider per OSD (for
- solid state media)
-
-:Type: Float
-:Default: ``21500.0``
-
-``osd_mclock_cost_per_io_usec``
-
-:Description: Cost per IO in microseconds to consider per OSD (overrides _ssd
- and _hdd if non-zero)
-
-:Type: Float
-:Default: ``0.0``
-
-``osd_mclock_cost_per_io_usec_hdd``
-
-:Description: Cost per IO in microseconds to consider per OSD (for rotational
- media)
-
-:Type: Float
-:Default: ``25000.0``
-
-``osd_mclock_cost_per_io_usec_ssd``
-
-:Description: Cost per IO in microseconds to consider per OSD (for solid state
- media)
-
-:Type: Float
-:Default: ``50.0``
-
-``osd_mclock_cost_per_byte_usec``
-
-:Description: Cost per byte in microseconds to consider per OSD (overrides _ssd
- and _hdd if non-zero)
-
-:Type: Float
-:Default: ``0.0``
-
-``osd_mclock_cost_per_byte_usec_hdd``
-
-:Description: Cost per byte in microseconds to consider per OSD (for rotational
- media)
-
-:Type: Float
-:Default: ``5.2``
-
-``osd_mclock_cost_per_byte_usec_ssd``
-
-:Description: Cost per byte in microseconds to consider per OSD (for solid state
- media)
-
-:Type: Float
-:Default: ``0.011``
+.. confval:: osd_mclock_profile
+.. confval:: osd_mclock_max_capacity_iops_hdd
+.. confval:: osd_mclock_max_capacity_iops_ssd
+.. confval:: osd_mclock_cost_per_io_usec
+.. confval:: osd_mclock_cost_per_io_usec_hdd
+.. confval:: osd_mclock_cost_per_io_usec_ssd
+.. confval:: osd_mclock_cost_per_byte_usec
+.. confval:: osd_mclock_cost_per_byte_usec_hdd
+.. confval:: osd_mclock_cost_per_byte_usec_ssd
projects / ceph.git / blobdiff