[pbs-devel] [PATCH v2 proxmox-backup 4/4] docs: add description for gc-cache-capacity tuning parameter

[Christian Ebner <c.ebner@proxmox.com>]

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>
---
changes since version 1:
- drop mentions of multiples of 1024, as raw values are used now

 docs/storage.rst | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/docs/storage.rst b/docs/storage.rst
index 490302955..c69df8b26 100644
--- a/docs/storage.rst
+++ b/docs/storage.rst
@@ -435,9 +435,16 @@ There are some tuning related options for the datastore that are more advanced:
 
   This can be set with:
 
-.. code-block:: console
+  .. code-block:: console
+
+    # proxmox-backup-manager datastore update <storename> --tuning 'sync-level=filesystem'
 
-  # proxmox-backup-manager datastore update <storename> --tuning 'sync-level=filesystem'
+* ``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
 with a comma, like this:
-- 
2.39.5



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