[pve-devel] [PATCH qemu-server 1/1] fix 1734: clone VM: if deactivation fails demote error to warning

[Hannes Duerr <h.duerr@proxmox.com>]

When a template with disks on LVM is cloned to another node, the storage
is first activated, then cloned and deactivated again after cloning.

However, if clones of this template are now created in parellel to other
nodes, it can happen that one of the tasks can no longer deactivate the
logical volume because it is still in use.  The reason for this is that
we use a shared lock.
Since the failed deactivation does not necessarily have consequences, we
downgrade the error to a warning, which means that the clone tasks will
continue to be completed successfully.

Signed-off-by: Hannes Duerr <h.duerr@proxmox.com>
---
 PVE/API2/Qemu.pm | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index 69c5896..f1e88b8 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -48,6 +48,7 @@ use PVE::DataCenterConfig;
 use PVE::SSHInfo;
 use PVE::Replication;
 use PVE::StorageTunnel;
+use PVE::RESTEnvironment qw(log_warn);
 
 BEGIN {
     if (!$ENV{PVE_GENERATING_DOCS}) {
@@ -3820,7 +3821,13 @@ __PACKAGE__->register_method({
 
 		if ($target) {
 		    # always deactivate volumes - avoid lvm LVs to be active on several nodes
-		    PVE::Storage::deactivate_volumes($storecfg, $vollist, $snapname) if !$running;
+		    eval {
+			PVE::Storage::deactivate_volumes($storecfg, $vollist, $snapname) if !$running;
+		    };
+		    my $err = $@;
+		    if ($err) {
+			log_warn("$err\n");
+		    }
 		    PVE::Storage::deactivate_volumes($storecfg, $newvollist);
 
 		    my $newconffile = PVE::QemuConfig->config_file($newid, $target);
-- 
2.39.2