[pve-devel] [PATCH guest-common] vzdump: config: improve description of ionice setting

[Fiona Ebner]

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 at 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