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$ ceph osd pool create xrbddiff1
pool 'xrbddiff1' created
$ rbd pool init xrbddiff1
$ rbd create --thick-provision --size 1M xrbddiff1/xtestdiff1 --no-progress
$ rbd diff xrbddiff1/xtestdiff1 --format json
[{"offset":0,"length":1048576,"exists":"true"}]
$ rbd rm xrbddiff1/xtestdiff1 --no-progress
$ rbd create --size 1M xrbddiff1/xtestdiff1
$ rbd diff xrbddiff1/xtestdiff1 --format json
[]
$ rbd snap create xrbddiff1/xtestdiff1 --snap=allzeroes --no-progress
$ rbd diff xrbddiff1/xtestdiff1 --format json
[]
$ rbd diff --from-snap=allzeroes xrbddiff1/xtestdiff1 --format json
[]
$ rbd bench --io-type write --io-size 1M --io-total 1M xrbddiff1/xtestdiff1 > /dev/null 2>&1
$ rbd diff xrbddiff1/xtestdiff1 --format json
[{"offset":0,"length":1048576,"exists":"true"}]
$ rbd diff --from-snap=allzeroes xrbddiff1/xtestdiff1 --format json
[{"offset":0,"length":1048576,"exists":"true"}]
$ rbd snap create xrbddiff1/xtestdiff1 --snap=snap1 --no-progress
$ rbd snap list xrbddiff1/xtestdiff1 --format json | python3 -mjson.tool --sort-keys | sed 's/,$/, /'
[
{
"id": *, (glob)
"name": "allzeroes",
"protected": "false",
"size": 1048576,
"timestamp": * (glob)
},
{
"id": *, (glob)
"name": "snap1",
"protected": "false",
"size": 1048576,
"timestamp": * (glob)
}
]
$ rbd diff --from-snap=snap1 xrbddiff1/xtestdiff1 --format json
[]
$ rbd snap rollback xrbddiff1/xtestdiff1@snap1 --no-progress
$ rbd diff --from-snap=snap1 xrbddiff1/xtestdiff1 --format json
[]
$ rbd snap rollback xrbddiff1/xtestdiff1@allzeroes --no-progress
$ rbd diff --from-snap=allzeroes xrbddiff1/xtestdiff1 --format json
[{"offset":0,"length":1048576,"exists":"false"}]
$ ceph osd pool rm xrbddiff1 xrbddiff1 --yes-i-really-really-mean-it
pool 'xrbddiff1' removed
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