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vzdump: config: improve description of ionice setting

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The CFQ scheduler was removed with Linux 5.0 and ionice is now used
by the newer BFQ scheduler. Mention what the special value 8 does.
Also mention that for snapshot and suspend mode backups of VMs, the
setting only affects the compressor, because the kvm process is not a
child process of vzdump then and does not inherit the ionice priority.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
This commit is contained in:
Fiona Ebner 2023-06-07 16:54:50 +02:00 committed by Thomas Lamprecht
parent 59b336314f
commit 29b4ce9390
1 changed files with 4 additions and 1 deletions
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src/PVE/VZDump/Common.pm
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@ -212,7 +212,10 @@ my $confdesc = {
}, },
ionice => { ionice => {
type => 'integer', type => 'integer',
description => "Set CFQ ionice priority.", description => "Set IO priority when using the BFQ scheduler. For snapshot and suspend "
."mode backups of VMs, this only affects the compressor. A value of 8 means the idle "
."priority is used, otherwise the best-effort priority is used with the specified "
."value.",
optional => 1, optional => 1,
minimum => 0, minimum => 0,
maximum => 8, maximum => 8,