help me understand ceph snapshot sizes

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



good morning,
  i am trying to understand ceph snapshot sizing. For example if i have 2.7
GB volume and i create a snap on it, the sizing says:

(BEFORE SNAP)

rbd du volumes/volume-d954915c-1dc1-41cb-8bf0-0c67e7b6e080
NAME PROVISIONED USED

volume-d954915c-1dc1-41cb-8bf0-0c67e7b6e080 10 GiB 2.7 GiB

(AFTER SNAP)

rbd du volumes/volume-d954915c-1dc1-41cb-8bf0-0c67e7b6e080
NAME PROVISIONED USED

volume-d954915c-1dc1-41cb-8bf0-0c67e7b6e080@snap01 10 GiB 2.7 GiB
volume-d954915c-1dc1-41cb-8bf0-0c67e7b6e080 10 GiB 0 B

<TOTAL> 10 GiB 2.7 GiB

why the SNAP is 2.7 GB? is not going to be 0 GB in the beginning and only
after the COW start doying its thing (copying original write blocks to snap
before overwrite with new ones) it should grow?

am i wrong?

thank you.
_______________________________________________
ceph-users mailing list -- ceph-users@xxxxxxx
To unsubscribe send an email to ceph-users-leave@xxxxxxx



[Index of Archives]     [Information on CEPH]     [Linux Filesystem Development]     [Ceph Development]     [Ceph Large]     [Ceph Dev]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [xfs]


  Powered by Linux