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
/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
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
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