2017-10-11 15:37 GMT+02:00 ML <[email protected]>: > 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 capacity. > 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 > partitions. > > 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 : >>> https://access.redhat.com/documentation/en-US/Red_Hat_Storag >>> e/3/html/Administration_Guide/Formatting_and_Mounting_Bricks.html >>> http://gluster.readthedocs.io/en/latest/Administrator%20Guid >>> e/Setting%20Up%20Volumes/ >>> >>> 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! :) >>> >>> Quentin >>> >> >> Hi Quentin, >> >> Gluster relies on LVM for snapshots - you won't get those unless you >> deploy on LVM. >> >> Regards, >> Ric >> >> _______________________________________________ >> Gluster-users mailing list >> [email protected] >> http://lists.gluster.org/mailman/listinfo/gluster-users >> > > _______________________________________________ > Gluster-users mailing list > [email protected] > http://lists.gluster.org/mailman/listinfo/gluster-users >
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