How to mount all cluster data to one particular Dir in single Host.

How to mount all cluster data to one particular Dir in single Host.

[hemant surale]

Hi Community,
       Is it possible to mount all cluster data on directory present
at single node? if yes how to do that? . I am using 3 VMs as a ceph
(v0.31 & ubuntu 11.10) cluster (3 osds,1 mon ,1 mds) & I was trying to
observe how file is stored over different OSDs when replication
parameter is set to 1.
 Any help is appriciable.


Regards,
Hemant Surale.

Re: How to mount all cluster data to one particular Dir in single Host.

[Mike Ryan]

On Thu, Aug 30, 2012 at 04:36:13PM +0530, hemant surale wrote:
> Is it possible to mount all cluster data on directory present at
> single node?

Are you trying to see the raw data, how files are stored by the OSD? You
can't mount them remotely, but you can log into your VMs and look in the
OSDs' data directories.

> v0.31 & ubuntu 11.10

These are both very old, and we don't support them anymore. For ceph you
should look into argonaut v0.48.1 or a more recent tag v0.51. For
Ubuntu, we recommend Precise 12.04.

Re: How to mount all cluster data to one particular Dir in single Host.

[hemant surale]

Sir,
I have some doubt regarding write and read operations performed.
Q1.
          Write goes to primary first and then appropriate replicas
can be updated but how read request is served ? does any replica can
answer read request or that also need to be served with primary copy
only?

Q2.
         How does primary is selected ? Can we get the info about
which is primary for particular object?

Till now I successfully able to put file into particular pool using
"rados put" .
Thanks for your prompt reply Sir. I will definitely go for Ceph v0.51
and Ubuntu 12.04.

Regards,
Hemant Surale.

On Thu, Aug 30, 2012 at 8:15 PM, Mike Ryan <mike.ryan@inktank.com> wrote:
> On Thu, Aug 30, 2012 at 04:36:13PM +0530, hemant surale wrote:
>> Is it possible to mount all cluster data on directory present at
>> single node?
>
> Are you trying to see the raw data, how files are stored by the OSD? You
> can't mount them remotely, but you can log into your VMs and look in the
> OSDs' data directories.
>
>> v0.31 & ubuntu 11.10
>
> These are both very old, and we don't support them anymore. For ceph you
> should look into argonaut v0.48.1 or a more recent tag v0.51. For
> Ubuntu, we recommend Precise 12.04.