---
tools/virsh.c | 4 ++++
tools/virsh.pod | 10 +++++++++-
2 files changed, 13 insertions(+), 1 deletions(-)
diff --git a/tools/virsh.c b/tools/virsh.c
index 66ba61c..4e30325 100644
--- a/tools/virsh.c
+++ b/tools/virsh.c
@@ -6733,6 +6733,7 @@ static const vshCmdOptDef opts_migrate[] = {
{"copy-storage-inc", VSH_OT_BOOL, 0, N_("migration with non-shared storage with incremental copy (same base image shared between source and destination)")},
{"change-protection", VSH_OT_BOOL, 0,
N_("prevent any configuration changes to domain until migration ends)")},
+ {"unsafe", VSH_OT_BOOL, 0, N_("force migration even if it may be unsafe")},
{"verbose", VSH_OT_BOOL, 0, N_("display the progress of migration")},
{"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")},
{"desturi", VSH_OT_DATA, VSH_OFLAG_REQ, N_("connection URI of the destination host as seen from the client(normal migration) or source(p2p migration)")},
@@ -6806,6 +6807,9 @@ doMigrate (void *opaque)
if (vshCommandOptBool (cmd, "change-protection"))
flags |= VIR_MIGRATE_CHANGE_PROTECTION;
+ if (vshCommandOptBool(cmd, "unsafe"))
+ flags |= VIR_MIGRATE_UNSAFE;
+
if (xmlfile &&
virFileReadAll(xmlfile, 8192, &xml) < 0) {
vshError(ctl, _("file '%s' doesn't exist"), xmlfile);
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 0d5a41d..c9c7b13 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -765,7 +765,7 @@ type attribute for the <domain> element of XML.
=item B<migrate> [I<--live>] [I<--direct>] [I<--p2p> [I<--tunnelled>]]
[I<--persistent>] [I<--undefinesource>] [I<--suspend>] [I<--copy-storage-all>]
-[I<--copy-storage-inc>] [I<--change-protection>] [I<--verbose>]
+[I<--copy-storage-inc>] [I<--change-protection>] [I<--unsafe>] [I<--verbose>]
I<domain-id> I<desturi> [I<migrateuri>] [I<dname>]
[I<--timeout> B<seconds>] [I<--xml> B<file>]
@@ -786,6 +786,14 @@ is implicitly enabled when supported by the hypervisor, but can be explicitly
used to reject the migration if the hypervisor lacks change protection
support. I<--verbose> displays the progress of migration.
+In some cases libvirt may refuse to migrate the domain because doing so may
+lead, e.g., to data corruption and thus the migration is considered unsafe.
+For QEMU domain, this may happen if the domain uses disks without explicitly
+setting cache mode to "none". Migrating such domains is unsafe unless the disk
+images are stored on coherent clustered filesystem, such as GFS2 or GPFS. If
+you are sure the migration is safe or you just do not care, use I<--unsafe>
+to force the migration.
+
The I<desturi> is the connection URI of the destination host, and
I<migrateuri> is the migration URI, which usually can be omitted.
I<dname> is used for renaming the domain to new name during migration, which
--
1.7.8.4
--
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