Hi,
I was testing qemu 2.3 with librbd, and I notice a warning
WARNING: Image format was not specified for
'rbd:pooltest/vm-100-disk-1:mon_host=10.5.0.16:auth_supported=none' and probing
guessed raw.
Automatically detecting the format is dangerous for raw images, write
operations on block 0 will be restricted.
Specify the 'raw' format explicitly to remove the restrictions.
It seem that we need to pass format=raw to the drive string, or we are not able
to write block0.
Don't have tested with other storages, but I think it should apply on iscsi,zfs
and sheepdog too
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