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docs: tape: clarify LTO-4/5 support 

some features we need (e.g. READ POSITION long form) are only officially
available with LTO-5, but work on many LTO-4 drives, so move LTO-4 to
'best-effort' support.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak 2021-05-03 11:27:46 +02:00 committed by Dietmar Maurer
parent 49f9aca627
commit ae5b1e188f
1 changed files with 4 additions and 2 deletions
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6
docs/tape-backup.rst
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@ -67,8 +67,10 @@ tape compression feature has no advantage.
Supported Hardware
------------------
Proxmox Backup Server supports `Linear Tape-Open`_ generation 4 (LTO-4)
or later.
Proxmox Backup Server supports `Linear Tape-Open`_ generation 5 (LTO-5)
or later and has best-effort support for generation 4 (LTO-4). While
many LTO-4 systems are known to work, some might need firmware updates or
do not implement necessary features to work with Proxmox Backup Server.
Tape changing is carried out using the SCSI Medium Changer protocol,
so all modern tape libraries should work.