qcow2: Change default cluster size to 64k
Larger cluster sizes mean less metadata. This has been discussion a few times,
let's do it now. This turns 64k clusters on by default for new images.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/block/qcow2.c b/block/qcow2.c
index c2be42e..14d8751 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1703,7 +1703,7 @@
const char *backing_fmt = NULL;
uint64_t sectors = 0;
int flags = 0;
- size_t cluster_size = 4096;
+ size_t cluster_size = 65536;
/* Read out options */
while (options && options->name) {
