rbd is already thin provisioned. when you set its size, your setting the maximum size. its explained here, http://ceph.com/docs/master/rbd/rados-rbd-cmds/
On Thu, Jul 30, 2015 at 12:04 PM Robert LeBlanc <robert@xxxxxxxxxxxxx> wrote:
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I'll take a stab at this.
I don't think it will be a feature that you will find in Ceph due to
the fact that Ceph doesn't really understand what is going on inside
the RBD. There are too many technologies that can use RBD that it is
not feasible to try and support something like this.
You can however have a service that runs in your VM which monitors
free space. Then the free space gets too low, it can call to a service
you write which will then expand the RBD on the fly and then the VM
itself and resize the partitions and the file system after the RBD is
expanded.
I'm not sure how CephFS fits into all of this as it is different than
RBD. CephFS is to NFS as RBD is to SAN block storage.
If I misunderstood the question, please clarify.
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Robert LeBlanc
PGP Fingerprint 79A2 9CA4 6CC4 45DD A904 C70E E654 3BB2 FA62 B9F1
On Wed, Jul 29, 2015 at 11:32 PM, Shneur Zalman Mattern
<shzama@xxxxxxxxxxxx> wrote:
> Hi to all!
>
>
> Perhaps, somebody already thought about, but my Googling had no results.
>
>
> How can I do RBD that will grow on demand of VM/client disk space.
>
> Are there in Ceph some options for this?
>
> Is it planned to do?
>
> Is it utopic idea?
>
> Is this client need CephFS already?
>
>
> Thanks,
>
> Shneur
>
>
>
>
>
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