Thank you for your response!
If the cloned VM had written around 10Gbs of data, wouldn't the clone
also show that much space?
Below is a list of the original image, the clone and new snapshots along
with their sizes.
The clone is still only a few hundred megabytes, while the snapshot
shows "10GB" of disk space.
[cephuser@ceph-las-admin-a1 ceph-cluster]$ rbd du
cvm/e01f31e94a65cf7e786972b915e07364-1
warning: fast-diff map is not enabled for
e01f31e94a65cf7e786972b915e07364-1. operation may be slow.
NAME PROVISIONED USED
e01f31e94a65cf7e786972b915e07364-1@d-1 61440M 10840M
e01f31e94a65cf7e786972b915e07364-1 61440M 616M
<TOTAL> 61440M 11456M
On 09-10-2017 17:22, Jason Dillaman wrote:
No -- it means that your clone had written approximately 10GB of space
within the image before you created the first snapshot. If the
"fast-diff" feature is enabled, note that it only calculates usage in
object size chunks (defaults to 4MB) -- which means that even writing
1 byte to a 4MB object would flag the object as dirty (it's an
upper-bound estimate).
On Sun, Oct 8, 2017 at 12:01 PM, Josy <josy@xxxxxxxxxxxxxxxxxxxxx> wrote:
Hello,
I noticed that when we create a snapshot of a clone, the first snapshot
seems to be quite large.
For example:
Clone VM is taking up 136MBs according to rbd du
First snapshot: 10GBs
Second snapshot: 104MBs
Third snapshot: 57MBs
The clone is a Windows virtual machine, which does take around 10GB if it
wasn't a clone. Does this mean that the first snapshot of a clone needs to
have a full copy of the original cloned image?
Ceph version : Luminous 12.2.1
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