[Gluster-users] gluster volume + lvm : recommendation or neccessity ?
rouge2507 at gmail.com
Wed Oct 11 16:20:36 UTC 2017
2017-10-11 15:37 GMT+02:00 ML <lists at websiteburo.com>:
> After some extra reading about LVM snapshots & Gluster, I think I can
> conclude it may be a bad idea to use it on big storage bricks.
> I understood that the LVM maximum metadata, used to store the snapshots
> data, is about 16GB.
LVM metadata aer used to store changed METADATA, not data.
thin-provisioned snapshots usually may grow up to the local unallocated
> So if I have a brick with a volume arount 10TB (for example), daily
> snapshots, files changing ~100GB : the LVM snapshot is useless.
> LVM's snapshots doesn't seems to be a good idea with very big LVM
> Did I missed something ? Hard to find clear documentation on the subject.
LVM documentation (RH has very good docs available via web) and even the
lvcreate man page is OK. not a lightweight read but OK. You need
thin-provisioned lvm pools to have snapshots in gluster.
> Le 11/10/2017 à 09:07, Ric Wheeler a écrit :
>> On 10/11/2017 09:50 AM, ML wrote:
>>> Hi everyone,
>>> I've read on the gluster & redhat documentation, that it seems
>>> recommended to use XFS over LVM before creating & using gluster volumes.
>>> Sources :
>>> My point is : do we really need LVM ?
>>> For example , on a dedicated server with disks & partitions that will
>>> not change of size, it doesn't seems necessary to use LVM.
>>> I can't understand clearly wich partitioning strategy would be the best
>>> for "static size" hard drives :
>>> 1 LVM+XFS partition = multiple gluster volumes
>>> or 1 LVM+XFS partition = 1 gluster volume per LVM+XFS partition
>>> or 1 XFS partition = multiple gluster volumes
>>> or 1 XFS partition = 1 gluster volume per XFS partition
>>> What do you use on your servers ?
>>> Thanks for your help! :)
>> Hi Quentin,
>> Gluster relies on LVM for snapshots - you won't get those unless you
>> deploy on LVM.
>> Gluster-users mailing list
>> Gluster-users at gluster.org
> Gluster-users mailing list
> Gluster-users at gluster.org
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