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Add details on l2arc_exclude_special (#275)

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kewiha
2022-03-05 18:13:01 +00:00
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parent 77b8563015
commit 1cbb76f064
1 changed files with 31 additions and 0 deletions
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docs/Performance and Tuning/Module Parameters.rst
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@@ -134,6 +134,7 @@ ARC
- `dbuf_cache_shift <#dbuf-cache-shift>`__ - `dbuf_cache_shift <#dbuf-cache-shift>`__
- `dbuf_metadata_cache_shift <#dbuf-metadata-cache-shift>`__ - `dbuf_metadata_cache_shift <#dbuf-metadata-cache-shift>`__
- `zfs_disable_dup_eviction <#zfs-disable-dup-eviction>`__ - `zfs_disable_dup_eviction <#zfs-disable-dup-eviction>`__
- `l2arc_exclude_special <#l2arc-exclude-special>`__
- `l2arc_feed_again <#l2arc-feed-again>`__ - `l2arc_feed_again <#l2arc-feed-again>`__
- `l2arc_feed_min_ms <#l2arc-feed-min-ms>`__ - `l2arc_feed_min_ms <#l2arc-feed-min-ms>`__
- `l2arc_feed_secs <#l2arc-feed-secs>`__ - `l2arc_feed_secs <#l2arc-feed-secs>`__
@@ -333,6 +334,7 @@ import
L2ARC L2ARC
~~~~~ ~~~~~
- `l2arc_exclude_special <#l2arc-exclude-special>`__
- `l2arc_feed_again <#l2arc-feed-again>`__ - `l2arc_feed_again <#l2arc-feed-again>`__
- `l2arc_feed_min_ms <#l2arc-feed-min-ms>`__ - `l2arc_feed_min_ms <#l2arc-feed-min-ms>`__
- `l2arc_feed_secs <#l2arc-feed-secs>`__ - `l2arc_feed_secs <#l2arc-feed-secs>`__
@@ -543,6 +545,7 @@ SPA
special_vdev special_vdev
~~~~~~~~~~~~ ~~~~~~~~~~~~
- `l2arc_exclude_special <#l2arc-exclude-special>`__
- `zfs_ddt_data_is_special <#zfs-ddt-data-is-special>`__ - `zfs_ddt_data_is_special <#zfs-ddt-data-is-special>`__
- `zfs_special_class_metadata_reserve_pct <#zfs-special-class-metadata-reserve-pct>`__ - `zfs_special_class_metadata_reserve_pct <#zfs-special-class-metadata-reserve-pct>`__
- `zfs_user_indirect_is_special <#zfs-user-indirect-is-special>`__ - `zfs_user_indirect_is_special <#zfs-user-indirect-is-special>`__
@@ -822,6 +825,7 @@ Index
- `zfs_immediate_write_sz <#zfs-immediate-write-sz>`__ - `zfs_immediate_write_sz <#zfs-immediate-write-sz>`__
- `zfs_initialize_value <#zfs-initialize-value>`__ - `zfs_initialize_value <#zfs-initialize-value>`__
- `zfs_key_max_salt_uses <#zfs-key-max-salt-uses>`__ - `zfs_key_max_salt_uses <#zfs-key-max-salt-uses>`__
- `l2arc_exclude_special <#l2arc-exclude-special>`__
- `l2arc_feed_again <#l2arc-feed-again>`__ - `l2arc_feed_again <#l2arc-feed-again>`__
- `l2arc_feed_min_ms <#l2arc-feed-min-ms>`__ - `l2arc_feed_min_ms <#l2arc-feed-min-ms>`__
- `l2arc_feed_secs <#l2arc-feed-secs>`__ - `l2arc_feed_secs <#l2arc-feed-secs>`__
@@ -1053,6 +1057,33 @@ ignore_hole_birth is an alias for and SysFS PARAMETER for
| Versions Affected | TBD | | Versions Affected | TBD |
+-------------------+-------------------------------------------------+ +-------------------+-------------------------------------------------+
l2arc_exclude_special
~~~~~~~~~~~~~~~~
Controls whether buffers present on special vdevs are eligible for
caching into L2ARC.
+-----------------------+-------------------------------------------------+
| l2arc_exclude_special | Notes |
+=======================+=================================================+
| Tags | `ARC <#arc>`__, |
| | `L2ARC <#l2arc>`__, |
| | `special_vdev <#special-vdev>`__, |
+-----------------------+-------------------------------------------------+
| When to change | If cache and special devices exist and caching |
| | data on special devices in L2ARC is not desired |
+-----------------------+-------------------------------------------------+
| Data Type | boolean |
+-----------------------+-------------------------------------------------+
| Range | 0=disabled, 1=enabled |
+-----------------------+-------------------------------------------------+
| Default | 0 |
+-----------------------+-------------------------------------------------+
| Change | Dynamic |
+-----------------------+-------------------------------------------------+
| Versions Affected | TBD |
+-----------------------+-------------------------------------------------+
l2arc_feed_again l2arc_feed_again
~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~