When virStorageBackendLogicalCreateVol() creates a snapshot for a logical volume with backingStore element, it fails with the message below: 2013-01-17 03:10:18.869+0000: 1967: error : virCommandWait:2345 : internal error Child process (/sbin/lvcreate --name lvm-snapshot -L 51200K -s=/dev/lvm-pool/lvm-volume) unexpected exit status 3: /sbin/lvcreate: invalid option -- '=' Error during parsing of command line. This is because virCommandAddArgPair() uses '=' to connect the two parameters, it's unsuitable for -s option of the lvcreate. Signed-off-by: Atsushi Kumagai <kumagai-atsushi(a)mxc.nes.nec.co.jp&gt; --- src/storage/storage_backend_logical.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/src/storage/storage_backend_logical.c b/src/storage/storage_backend_logical.c index 91db3fd..bb709df 100644 --- a/src/storage/storage_backend_logical.c +++ b/src/storage/storage_backend_logical.c @@ -736,7 +736,7 @@ virStorageBackendLogicalCreateVol(virConnectPtr conn, } virCommandAddArgFormat(cmd, "%lluK", VIR_DIV_UP(vol->capacity, 1024)); if (vol->backingStore.path) - virCommandAddArgPair(cmd, "-s", vol->backingStore.path); + virCommandAddArgList(cmd, "-s", vol->backingStore.path, NULL); else virCommandAddArg(cmd, pool->def->source.name);