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storage physical_block_size is restricted to uint16_t
It is desirable to set -global scsi-hd.physical_block_size=4194304 for RBD-backed storage.
But unfortunatelly, this values is restricted with uint16_t, i.e. 65536 maximum.
For example, scsi-hd.discard_granularity=4194304 is not so restricted (and works as expected)
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