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docs: basic maintenance mode section 

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Thomas Lamprecht 2022-05-17 13:28:24 +02:00
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docs/maintenance.rst
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@ -186,3 +186,20 @@ following options are available:
* Errors: send a notification for any scheduled task that results in an error
* Never: do not send any notification at all
.. _maintenance_mode:
Maintenance Mode
----------------
Proxmox Backup Server implements setting the `read-only` and `offline`
maintenance modes for a datastore.
Once enabled, depending on the mode, new reads and/or writes to the datastore
are blocked, allowing an administrator to safely execute maintenance tasks, for
example, on the underlying storage.
Internally Proxmox Backup Server tracks whether each datastore access is a
write or read operation, so that it can gracefully enter the respective mode,
by allowing conflicting operations that started before enabling the maintenance
mode to finish.