If the clone has written 10GB of data, yes, the clone should show 10GB. I am not sure what you are referring to when you say "clone" since you only included a single image in your response. The clone is the image chained from a parent image snapshot. Is "e01f31e94a65cf7e786972b915e07364-1@d-1" the clone's parent? On Mon, Oct 9, 2017 at 5:14 PM, Josy <josy@xxxxxxxxxxxxxxxxxxxxx> wrote: > 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 >>> >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@xxxxxxxxxxxxxx >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >> > > -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |