/dev/rbd1 xfs 40T 198G 39T 1% /CLOUD_BACKUP
/dev/rbd2 xfs 40G 33M 40G 1% /TEST_POOL
실제 사용하고 있는 데이터 양을 보는건 아니네.....;;;;
# time rbd diff test_pool/image | awk '{ SUM += $2 } END { print SUM/1024/1024 " MB" }'
24.4062 MB
real 0m1.375s
user 0m2.870s
sys 0m1.001s
# time rbd diff backup/vm_image | awk '{ SUM += $2 } END { print SUM/1024/1024 " MB" }'
884995 MB
real 37m52.516s
user 48m25.052s
sys 16m58.777s
