[Gluster-devel] LVM

[Krishna Srinivas]

Onyx,

Just thinking about it, using snapshots as glusterfs storage volumes
is not advisable unless you know what you are doing. If you roll back
a volume, it will depend on how selfheal of unify/afr handle it. AFR
would just update the rolled back volume with the other copy.
Better use of LVM + glusterfs would be to grow the backend FS
as an when needed.
I think use case of snapshots just in backend LVM in a glusterfs
environment will not be much. However snapshots in a glusterfs
as a whole filesystem will be useful.

Krishna

On Sat, Jun 14, 2008 at 4:13 PM, Onyx <lists at bmail.be> wrote:
> Hmm, yes, what was I thinking....
>
> But if I want to use LVM snapshots underneath glusterfs volumes (on
> different bricks) who are then unified or afr'd,  won't there be a problem
> because the snapshots aren't taken at exactly the same time? Or what would
> be the expected behavior if I for example roll back one volume in an afr
> setup and not the other?
>
>
>
>
>
> Anand Babu Periasamy wrote:
>>
>> --
>> Anand Babu Periasamy
>> GPG Key ID: 0x62E15A31
>> Blog [http://ab.freeshell.org]
>> The GNU Operating System [http://www.gnu.org]
>> Z RESEARCH Inc [http://www.zresearch.com]
>>
>> Hi Onyx,
>> GlusterFS volumes are file based. LVM requires block based
>> store. You cannot have LVM over GlusterFS. I am assuming
>> you are asking about GlusterFS over LVM. You can use LVM and
>> its snapshotting ability underneath the GlusterFS posix volume.
>> It will work transparently.
>>
>> --
>> Anand Babu Periasamy
>> GPG Key ID: 0x62E15A31
>> Blog [http://ab.freeshell.org]
>> The GNU Operating System [http://www.gnu.org]
>> Z RESEARCH Inc [http://www.zresearch.com]
>>
>>
>>
>> Onyx wrote:
>>>
>>> Has anyone ever tested LVM on top of a glusterfs volume? Would this even
>>> be possible?
>>> I'm interested because of the snapshot feature of LVM.
>>>
>>> Thanks!
>>>
>>>
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>
>
>
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