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tape: improve retention period docu

This commit is contained in:
Dietmar Maurer 2021-01-11 07:11:17 +01:00
parent 6638c034d2
commit e84b801c2e
1 changed files with 10 additions and 3 deletions
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13
docs/tape-backup.rst
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@ -384,6 +384,9 @@ one media pool, so a job only uses tapes from that pool.
trigger new set creation by running a backup job with the trigger new set creation by running a backup job with the
``--export`` option. ``--export`` option.
.. NOTE:: Retention period starts with the existence of a newer
media set.
- Always create a new media set. - Always create a new media set.
With this setting each backup job creates a new media set. This With this setting each backup job creates a new media set. This
@ -394,6 +397,9 @@ one media pool, so a job only uses tapes from that pool.
size. Small set are easier to handle, you can move sets to an size. Small set are easier to handle, you can move sets to an
off-site vault, and restore is much faster. off-site vault, and restore is much faster.
.. NOTE:: Retention period starts with the creation time of the
media set.
- Create a new set when the specified Calendar Event triggers. - Create a new set when the specified Calendar Event triggers.
.. _systemd.time manpage: https://manpages.debian.org/buster/systemd/systemd.time.7.en.html .. _systemd.time manpage: https://manpages.debian.org/buster/systemd/systemd.time.7.en.html
@ -406,6 +412,9 @@ one media pool, so a job only uses tapes from that pool.
This balances between space efficency and media count. This balances between space efficency and media count.
.. NOTE:: Retention period starts when the calendar event
triggers.
Additionally, the following events may allocate a new media set: Additionally, the following events may allocate a new media set:
- Required tape is offline (and you use a tape library). - Required tape is offline (and you use a tape library).
@ -418,9 +427,7 @@ one media pool, so a job only uses tapes from that pool.
.. topic:: Retention Policy .. topic:: Retention Policy
Defines how long we want to keep the data. Retention period starts Defines how long we want to keep the data.
with the existence of a newer media set, e.g. when the allocation
policy calendar event triggers.
- Always overwrite media. - Always overwrite media.