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$ rbd create --size 20M img
$ DEV=$(sudo rbd map img)
$ blockdev --getiomin $DEV
65536
$ blockdev --getioopt $DEV
65536
$ cat /sys/block/${DEV#/dev/}/queue/discard_granularity
65536
$ sudo rbd unmap $DEV
$ DEV=$(sudo rbd map -o alloc_size=512 img)
$ blockdev --getiomin $DEV
512
$ blockdev --getioopt $DEV
512
$ cat /sys/block/${DEV#/dev/}/queue/discard_granularity
512
$ sudo rbd unmap $DEV
$ DEV=$(sudo rbd map -o alloc_size=4194304 img)
$ blockdev --getiomin $DEV
4194304
$ blockdev --getioopt $DEV
4194304
$ cat /sys/block/${DEV#/dev/}/queue/discard_granularity
4194304
$ sudo rbd unmap $DEV
$ DEV=$(sudo rbd map -o alloc_size=8388608 img)
$ blockdev --getiomin $DEV
4194304
$ blockdev --getioopt $DEV
4194304
$ cat /sys/block/${DEV#/dev/}/queue/discard_granularity
4194304
$ sudo rbd unmap $DEV
$ rbd rm --no-progress img
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