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vzdump: add 'performance' property string as a setting

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Initially, to be used for tuning backup performance with QEMU.

A few users reported IO-related issues during backup after upgrading
to PVE 7.x and using a modified QEMU build with max-workers reduced to
8 instead of 16 helped them [0].

Also generalizes the way vzdump property string are handled for easier
extension in the future.

[0]: https://forum.proxmox.com/threads/113790/

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
This commit is contained in:
Fiona Ebner 2022-10-03 15:52:05 +02:00 committed by Wolfgang Bumiller
parent bdbc909757
commit e8d7ef5be3
1 changed files with 32 additions and 10 deletions
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42
src/PVE/VZDump/Common.pm
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@ -29,16 +29,21 @@ my $dowhash_to_dow = sub {
return join ',', @da;
};
my $fixup_prune_backups_option = sub {
our $PROPERTY_STRINGS = {
'performance' => 'backup-performance',
'prune-backups' => 'prune-backups',
};
my sub parse_property_strings {
my ($opts) = @_;
return if !defined($opts->{'prune-backups'});
for my $opt (keys $PROPERTY_STRINGS->%*) {
next if !defined($opts->{$opt});
$opts->{'prune-backups'} = PVE::JSONSchema::parse_property_string(
'prune-backups',
$opts->{'prune-backups'}
);
};
my $format = $PROPERTY_STRINGS->{$opt};
$opts->{$opt} = PVE::JSONSchema::parse_property_string($format, $opts->{$opt});
}
}
# parse crontab style day of week
sub parse_dow {
@ -71,6 +76,17 @@ sub parse_dow {
return $res;
};
PVE::JSONSchema::register_format('backup-performance', {
'max-workers' => {
description => "Applies to VMs. Allow up to this many IO workers at the same time.",
type => 'integer',
minimum => 1,
maximum => 256,
default => 16,
optional => 1,
},
});
my $confdesc = {
vmid => {
type => 'string', format => 'pve-vmid-list',
@ -196,6 +212,12 @@ my $confdesc = {
maximum => 8,
default => 7,
},
performance => {
type => 'string',
description => "Other performance-related settings.",
format => 'backup-performance',
optional => 1,
},
lockwait => {
type => 'integer',
description => "Maximal time to wait for the global lock (minutes).",
@ -311,7 +333,7 @@ sub parse_vzdump_cron_config {
$opts->{starttime} = sprintf "%02d:%02d", $hour, $minute;
$opts->{dow} = &$dowhash_to_dow($dowhash);
$fixup_prune_backups_option->($opts); # parse the property string
parse_property_strings($opts);
push @$jobs, $opts;
};
@ -402,8 +424,8 @@ sub command_line {
}
} else {
$v = join(",", PVE::Tools::split_list($v)) if $p eq 'mailto';
$v = PVE::JSONSchema::print_property_string($v, 'prune-backups')
if $p eq 'prune-backups';
$v = PVE::JSONSchema::print_property_string($v, $PROPERTY_STRINGS->{$p})
if $PROPERTY_STRINGS->{$p};
$cmd .= " --$p " . PVE::Tools::shellquote($v) if defined($v) && $v ne '';
}