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.eb...@proxmox.com>
---
src/PVE/VZDump/Common.pm | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/src/PVE/VZDump/Common.pm b/src/PVE/VZDump/Common.pm
index 4b0e8e0..830c3e8 100644
--- a/src/PVE/VZDump/Common.pm
+++ b/src/PVE/VZDump/Common.pm
@@ -209,7 +209,10 @@ my $confdesc = {
},
ionice => {
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,
minimum => 0,
maximum => 8,
--
2.30.2
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