[pbs-devel] [PATCH proxmox-backup 3/3] docs: add garbage collection timing example

Hannes Duerr h.duerr at proxmox.com
Tue Apr 2 15:36:27 CEST 2024


To make the garbage collection process easier to understand, we add a
timing example with a graphic.

Signed-off-by: Hannes Duerr <h.duerr at proxmox.com>
---
 docs/images/garbage-collection-timing.svg | 2513 +++++++++++++++++++++
 docs/maintenance.rst                      |   25 +
 2 files changed, 2538 insertions(+)
 create mode 100644 docs/images/garbage-collection-timing.svg

diff --git a/docs/images/garbage-collection-timing.svg b/docs/images/garbage-collection-timing.svg
new file mode 100644
index 00000000..8108ee23
--- /dev/null
+++ b/docs/images/garbage-collection-timing.svg
@@ -0,0 +1,2513 @@
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+           sodipodi:role="line">unused chunk (atime older t<tspan
+   style="font-size:65%;baseline-shift:sub"
+   id="tspan4572">cutoff</tspan>)</tspan></text>
+      <g
+         id="g2947"
+         transform="matrix(0.22510186,0,0,0.22510186,146.68396,174.31959)"
+         inkscape:label="chunk"
+         style="display:inline">
+        <rect
+           style="display:inline;fill:url(#pattern37450);fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:0.439473;stroke-dasharray:none;stroke-opacity:1"
+           id="rect2935"
+           width="12.188926"
+           height="12.188926"
+           x="103.01205"
+           y="-259.12012"
+           ry="3.093152"
+           transform="matrix(0,2.6061124,-2.6061124,0,-576.13291,-241.96985)"
+           rx="3.093152"
+           inkscape:label="background" />
+      </g>
+      <g
+         id="g38446"
+         transform="matrix(0.22510186,0,0,0.22510186,146.68396,164.87529)"
+         inkscape:label="chunk"
+         style="display:inline">
+        <rect
+           style="display:inline;fill:url(#pattern37287);fill-opacity:1;fill-rule:evenodd;stroke:#000000;stroke-width:0.439473;stroke-dasharray:none;stroke-opacity:1"
+           id="rect38434"
+           width="12.188926"
+           height="12.188926"
+           x="103.01205"
+           y="-259.12012"
+           ry="3.093152"
+           transform="matrix(0,2.6061124,-2.6061124,0,-576.13291,-241.96985)"
+           rx="3.093152"
+           inkscape:label="background" />
+      </g>
+    </g>
+  </g>
+</svg>
diff --git a/docs/maintenance.rst b/docs/maintenance.rst
index baa1241e..f4edfd6b 100644
--- a/docs/maintenance.rst
+++ b/docs/maintenance.rst
@@ -233,6 +233,31 @@ by the GC as it cannot be certain whether they are still needed.
    which is 24 hours by default.
 
 
+Timing Example
+^^^^^^^^^^^^^^
+
+.. figure:: images/garbage-collection-timing.svg
+  :class: proxmox-svg
+  :alt: Garbage Collection timing
+
+t\ :sub:`0`\:
+All chunks are part of the backup indices. Some chunks have a newer
+``atime`` than the cut-off time, while others have not been accessed
+for a while (e.g. because they were only created by a new backup).
+
+t\ :sub:`1`\:
+A backup has been deleted and some chunks are no longer used
+
+t\ :sub:`2`\:
+The first phase of the GC begins and the ``atime`` of the chunks that
+are still being used by a backup are updated
+
+t\ :sub:`3`\:
+The second phase of the GC begins. Chunks that have not been used and
+whose ``atime`` is older than the cut-off time are deleted. Chunks that
+have not been used but whose ``atime`` is newer than the cut-off time
+are not yet deleted, but are marked as pending as a precaution.
+
 Manually Starting GC
 ^^^^^^^^^^^^^^^^^^^^
 
-- 
2.39.2





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