<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">2017-10-11 15:37 GMT+02:00 ML <span dir="ltr"><<a href="mailto:lists@websiteburo.com" target="_blank">lists@websiteburo.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">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.<br>
<br>
I understood that the LVM maximum metadata, used to store the snapshots data, is about 16GB.<br></blockquote><div><br></div><div>LVM metadata aer used to store changed METADATA, not data. thin-provisioned snapshots usually may grow up to the local unallocated capacity.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
So if I have a brick with a volume arount 10TB (for example), daily snapshots, files changing ~100GB : the LVM snapshot is useless.<br>
<br>
LVM's snapshots doesn't seems to be a good idea with very big LVM partitions.<br>
<br>
Did I missed something ? Hard to find clear documentation on the subject.<br></blockquote><div><br></div><div>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. </div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="gmail-HOEnZb"><div class="gmail-h5">
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Le 11/10/2017 à 09:07, Ric Wheeler a écrit :<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
On 10/11/2017 09:50 AM, ML wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Hi everyone,<br>
<br>
I've read on the gluster & redhat documentation, that it seems recommended to use XFS over LVM before creating & using gluster volumes.<br>
<br>
Sources :<br>
<a href="https://access.redhat.com/documentation/en-US/Red_Hat_Storage/3/html/Administration_Guide/Formatting_and_Mounting_Bricks.html" rel="noreferrer" target="_blank">https://access.redhat.com/docu<wbr>mentation/en-US/Red_Hat_Storag<wbr>e/3/html/Administration_Guide/<wbr>Formatting_and_Mounting_Bricks<wbr>.html</a> <br>
<a href="http://gluster.readthedocs.io/en/latest/Administrator%20Guide/Setting%20Up%20Volumes/" rel="noreferrer" target="_blank">http://gluster.readthedocs.io/<wbr>en/latest/Administrator%20Guid<wbr>e/Setting%20Up%20Volumes/</a> <br>
<br>
My point is : do we really need LVM ?<br>
For example , on a dedicated server with disks & partitions that will not change of size, it doesn't seems necessary to use LVM.<br>
<br>
I can't understand clearly wich partitioning strategy would be the best for "static size" hard drives :<br>
<br>
1 LVM+XFS partition = multiple gluster volumes<br>
or 1 LVM+XFS partition = 1 gluster volume per LVM+XFS partition<br>
or 1 XFS partition = multiple gluster volumes<br>
or 1 XFS partition = 1 gluster volume per XFS partition<br>
<br>
What do you use on your servers ?<br>
<br>
Thanks for your help! :)<br>
<br>
Quentin<br>
</blockquote>
<br>
Hi Quentin,<br>
<br>
Gluster relies on LVM for snapshots - you won't get those unless you deploy on LVM.<br>
<br>
Regards,<br>
Ric<br>
<br>
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