by re-using a dirty bitmap that represents changes since the divergence
of source and target volume. requires a qemu that supports incremental
drive-mirroring, and will die otherwise.
Signed-off-by: Fabian Grünbichler <f.gruenbich...@proxmox.com>
---
Notes:
v1-v2:
- use newer Qemu patches picked up by me and submitted upstream
this requires a patched qemu, so we might want to check for that in the
migration code?
it is only required on the source node (where we can just use a
versioned-dependency from qemu-server to pve-qemu-kvm), but maybe we want to
avoid migrating from patched nodes to unpatched nodes, since the VM is then
stuck there and can only be migrated offline/after an upgrade of the host
and
cold reboot of the VM..
PVE/QemuServer.pm | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index b2ff515..83033df 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -6521,7 +6521,7 @@ sub qemu_img_format {
}
sub qemu_drive_mirror {
- my ($vmid, $drive, $dst_volid, $vmiddst, $is_zero_initialized, $jobs,
$skipcomplete, $qga, $bwlimit) = @_;
+ my ($vmid, $drive, $dst_volid, $vmiddst, $is_zero_initialized, $jobs,
$skipcomplete, $qga, $bwlimit, $src_bitmap) = @_;
$jobs = {} if !$jobs;
@@ -6548,6 +6548,12 @@ sub qemu_drive_mirror {
my $opts = { timeout => 10, device => "drive-$drive", mode => "existing",
sync => "full", target => $qemu_target };
$opts->{format} = $format if $format;
+ if (defined($src_bitmap)) {
+ $opts->{sync} = 'incremental';
+ $opts->{bitmap} = $src_bitmap;
+ print "drive mirror re-using dirty bitmap '$src_bitmap'\n";
+ }
+
if (defined($bwlimit)) {
$opts->{speed} = $bwlimit * 1024;
print "drive mirror is starting for drive-$drive with bandwidth limit:
${bwlimit} KB/s\n";
--
2.20.1
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