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docs/administration-guide.rst: document garbage collection

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Dietmar Maurer 2019-12-14 15:52:25 +01:00
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@ -488,7 +488,41 @@ on that.
Garbage Collection
~~~~~~~~~~~~~~~~~~
.. todo:: write garbage-collection section
The ``prune`` command removes only the backup index files, not the data
from the data store. This task is left to the garbage collection
command. It is therefore recommended to carry out garbage collection
regularly.
The garbage collection works in two phases. In the first phase, all
data blocks that are still in use are marked. In the second phase,
unused data blocks are removed.
.. note:: This command needs to read all existing backup index files
and touches the complete chunk store. This can take a long time
depending on the number of chunk and the speed of the underlying
disks.
.. code-block:: console
# proxmox-backup-client garbage-collect
starting garbage collection on store store2
Start GC phase1 (mark used chunks)
Start GC phase2 (sweep unused chunks)
percentage done: 1, chunk count: 219
percentage done: 2, chunk count: 453
...
percentage done: 99, chunk count: 21188
Removed bytes: 411368505
Removed chunks: 203
Original data bytes: 327160886391
Disk bytes: 52767414743 (16 %)
Disk chunks: 21221
Average chunk size: 2486565
TASK OK
.. todo:: howto run garbage-collection at regular intervalls (cron)
.. _pve-integration: