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docs: add description for gc-cache-capacity tuning parameter

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Adds a bullet point to the listed datastore tuning parameters,
describing its functionality, implications and typical values.

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Link: https://lore.proxmox.com/pbs-devel/20250404130713.376630-4-c.ebner@proxmox.com
 [TL: address trivial merge conflict from context changes]
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Christian Ebner 2025-04-04 15:07:13 +02:00 committed by Thomas Lamprecht
parent 6df6d3094c
commit 6c774660a7
2 changed files with 8 additions and 1 deletions
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7
docs/storage.rst
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@ -451,6 +451,13 @@ There are some tuning related options for the datastore that are more advanced:
during phase 2 of garbage collection (given no older writers). If the during phase 2 of garbage collection (given no older writers). If the
``atime`` of the chunk is outside the range, it will be removed. ``atime`` of the chunk is outside the range, it will be removed.
* ``gc-cache-capacity``: Datastore GC least recently used cache capacity:
Allows to control the cache capacity used to keep track of chunks for which
the access time has already been updated during phase 1 of garbage collection.
This avoids multiple updates and increases GC runtime performance. Higher
values can reduce GC runtime at the cost of increase memory usage, setting the
value to 0 disables caching.
If you want to set multiple tuning options simultaneously, you can separate them If you want to set multiple tuning options simultaneously, you can separate them
with a comma, like this: with a comma, like this:

2
www/datastore/OptionView.js
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@ -301,7 +301,7 @@ Ext.define('PBS.Datastore.Options', {
fieldLabel: gettext('GC cache capacity'), fieldLabel: gettext('GC cache capacity'),
emptyText: Proxmox.Utils.defaultText, emptyText: Proxmox.Utils.defaultText,
minValue: 0, minValue: 0,
maxValue: 8192 * 1024, maxValue: 8 * 1024 * 1024,
deleteEmpty: true, deleteEmpty: true,
step: 1024, step: 1024,
}, },