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Chapter 24. Writeback Throttle
Ceph replicates some of the writeback behavior in the kernel, because the page cache tends to keep dirty data round too long.
filestore_wbthrottle_enable
- Description
- Enables the filestore writeback throttle. The filestore writeback throttle is used to prevent large amounts of uncommitted data from building up before each filestore sync. (Experts only).
- Type
- Boolean
- Default
-
true
filestore_wbthrottle_btrfs_bytes_start_flusher
- Description
-
Dirty bytes threshold at which Ceph begins background flushing for
btrfs. - Type
- 64-bit Unsigned Integer
- Default
-
41943040
filestore_wbthrottle_btrfs_bytes_hard_limit
- Description
-
Dirty bytes threshold at which Ceph begins to throttle I/O until the flusher catches up for
btrfs. - Type
- 64-bit Unsigned Integer
- Default
-
419430400
filestore_wbthrottle_btrfs_ios_start_flusher
- Description
-
Dirty ios threshhold at which Ceph begins background flushing for
btrfs. - Type
- 64-bit Unsigned Integer
- Default
-
500
filestore_wbthrottle_btrfs_ios_hard_limit
- Description
-
Dirty ios threshhold at which Ceph begins to throttle IO until the flusher catches up for
btrfs. - Type
- 64-bit Unsigned Integer
- Default
-
5000
filestore_wbthrottle_btrfs_inodes_start_flusher
- Description
-
Dirty inodes threshhold at which Ceph begins background flushing for
btrfs. - Type
- 64-bit Unsigned Integer
- Default
-
500
filestore_wbthrottle_btrfs_inodes_hard_limit
- Description
-
Dirty inodes threshhold at which Ceph begins to throttle IO until the flusher catches up for
btrfs. Must be less than thefdlimit. - Type
- 64-bit Unsigned Integer
- Default
-
5000
filestore_wbthrottle_xfs_bytes_start_flusher
- Description
- Dirty bytes threshold at which Ceph begins background flushing for XFS.
- Type
- 64-bit Unsigned Integer
- Default
-
41943040
filestore_wbthrottle_xfs_bytes_hard_limit
- Description
- Dirty bytes threshold at which Ceph begins to throttle IO until the flusher catches up for XFS.
- Type
- 64-bit Unsigned Integer
- Default
-
419430400
filestore_wbthrottle_xfs_ios_start_flusher
- Description
- Dirty ios threshhold at which Ceph begins background flushing for XFS.
- Type
- 64-bit Unsigned Integer
- Default
-
500
filestore_wbthrottle_xfs_ios_hard_limit
- Description
- Dirty ios threshhold at which Ceph begins to throttle IO until the flusher catches up for XFS.
- Type
- 64-bit Unsigned Integer
- Default
-
5000
filestore_wbthrottle_xfs_inodes_start_flusher
- Description
- Dirty inodes threshhold at which Ceph begins background flushing for XFS.
- Type
- 64-bit Unsigned Integer
- Default
-
500
filestore_wbthrottle_xfs_inodes_hard_limit
- Description
-
Dirty inodes threshhold at which Ceph begins to throttle IO until the flusher catches up for XFS. Must be less than the
fdlimit. - Type
- 64-bit Unsigned Integer
- Default
-
5000
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