Hello All,
I am currently trying to get an accurate count of bytes used for an rbd
image. I've tried trimming the filesystem which relieves about 1.7gb
however there is still a huge disparity of size reported in the filesystem
vs what 'rbd diff' shows;
$ rbd map backup/cd4e5d37-3023-4640-be5a-5577d3f9307e
/dev/rbd3
$ mount -o discard /dev/rbd3p1 /tmp/cd4e5d37-3023-4640-be5a-5577d3f9307e/
$ df -h /tmp/cd4e5d37-3023-4640-be5a-5577d3f9307e/
Filesystem Size Used Avail Use% Mounted on
/dev/rbd3p1 50G 24G 24G 50%
/tmp/cd4e5d37-3023-4640-be5a-5577d3f9307e
$ df -i /tmp/cd4e5d37-3023-4640-be5a-5577d3f9307e/
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/rbd3p1 3276800 582930 2693870 18%
/tmp/cd4e5d37-3023-4640-be5a-5577d3f9307e
$ fstrim -v /tmp/cd4e5d37-3023-4640-be5a-5577d3f9307e/
/tmp/cd4e5d37-3023-4640-be5a-5577d3f9307e/: 1.7 GiB (1766875136 bytes)
trimmed
$ rbd diff backup/cd4e5d37-3023-4640-be5a-5577d3f9307e | awk '{ SUM += $2 }
END { print SUM/1024/1024 " MB" }'
49345.4 MB
Could this be affected by replica counts some how? It seems to be twice as
large as what is reported in the filesystem which matches my replica count.
Thanks for any and all assistance!
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