qemu-iotests: 026: Reduce output changes for cache=none qcow2
qemu-iotests supports the -nocache option which makes the tests run with cache=none. For blkdebug tests with qcow2 this means that we may see test results that differ from cache=writethrough. This patch makes the diff a bit smaller and therefore easier to review. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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