They are 'thin provisioned' meaning if you create a 10GB rbd, it does not use 10GB at the start. (afaik) -----Original Message----- From: solarflow99 [mailto:solarflow99@xxxxxxxxx] Sent: 27 February 2019 22:55 To: Ceph Users Subject: rbd space usage using ceph df it looks as if RBD images can use the total free space available of the pool it belongs to, 8.54% yet I know they are created with a --size parameter and thats what determines the actual space. I can't understand the difference i'm seeing, only 5T is being used but ceph df shows 51T: /dev/rbd0 8.0T 4.8T 3.3T 60% /mnt/nfsroot/rbd0 /dev/rbd1 9.8T 34M 9.8T 1% /mnt/nfsroot/rbd1 # ceph df GLOBAL: SIZE AVAIL RAW USED %RAW USED 180T 130T 51157G 27.75 POOLS: NAME ID USED %USED MAX AVAIL OBJECTS rbd 0 15745G 8.54 39999G 4043495 cephfs_data 1 0 0 39999G 0 cephfs_metadata 2 1962 0 39999G 20 spider_stage 9 1595M 0 39999G 47835 spider 10 955G 0.52 39999G 42541237 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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