Re: ceph storage capacity does not free when deleting contents from RBD volumes

[David Turner <david.turner@xxxxxxxxxxxxxxxx>]

You can also mount the rbd with the discard option. It works the same way as you would mount an ssd to free up the space when you delete things. I use the discard option on my ext4 rbds on Ubuntu and it frees up the used Ceph space immediately.

Sent from my iPhone

On May 19, 2016, at 12:30 PM, Albert Archer <albertarcher94@xxxxxxxxx> wrote:

Thank you for your great support .

Best Regards

Albert

On Thu, May 19, 2016 at 10:41 PM, Udo Lembke <ulembke@xxxxxxxxxxxx> wrote:

Hi Albert,
to free unused space you must enable trim (or do an fstrim) in the vm - and all things in the storage chain must support this.
The normal virtio-driver don't support trim, but if you use scsi-disks with virtio-scsi-driver you can use it.
Work well but need some time for huge filesystems.

Udo

On 19.05.2016 19:58, Albert Archer wrote:

Hello All.
I am newbie in ceph. and i use jewel release for testing purpose. it
seems every thing is OK, HEALTH_OK , all of OSDs are in UP and IN state.
I create some RBD images (rbd create .... ) and map to some ubuntu
host . 
I can read and write data to my volume , but when i delete some content
from volume (e,g some huge files,...), populated capacity of cluster
does not free and None of objects were clean.
what is the problem ???

Regards 

Albert

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