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.
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.
++
Quentin
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_Storage/3/html/Administration_Guide/Formatting_and_Mounting_Bricks.html
http://gluster.readthedocs.io/en/latest/Administrator%20Guide/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
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