Thank you so much Strahil ! Yes, this would be the setup. Basically, I will equip the 3rd node with only some consumer grade ssds to have the arbiter metadata for all the volumes, while having the 1st and 2nd nodes equipped with proper dc grade disks for both spinning and ssd volumes. This will drastically reduce costs... Thank you !
On Thu, Apr 25, 2019, 15:12 Strahil Nikolov <[email protected]> wrote: > I can't get the idea. Can you give an example. > > let me share some of my setup. > 1. Volume -> data_fast is consisting of: > ovirt1:/gluster_bricks/data_fast/data_fast -> 500GB NVMe > ovirt2:/gluster_bricks/data_fast/data_fast -> 500GB NVMe > ovirt3:/gluster_bricks/data_fast/data_fast -> small LV on a slow > (QLC-based) SATA SSD > > All hosted on thin LVM. > Of course , for the engine I have: > ovirt1:/gluster_bricks/engine/engine -> SATA ssd shared between OS and > brick > ovirt2:/gluster_bricks/engine/engine -> SATA ssd shared between OS and > brick > ovirt3:/gluster_bricks/engine/engine -> SATA ssd shared between OS and 4 > other bricks > > Since I have switched from old HDDs to consumer SSD disks - the engine > volume is not reported by sanlock.service , despite Gluster v52.XX has > higher latency. > > Best Regards, > Strahil Nikolov > > > > В сряда, 24 април 2019 г., 21:25:10 ч. Гринуич-4, Leo David < > [email protected]> написа: > > > Thank you very much Strahil, very helpful. As always. So I would equip the > 3rd server and alocate one small ( 120 - 240gb) consumer grade ssd for each > of the gluster volume, and at volume creation, to specify the small ssds as > the 3rd brick. > Do it make sense ? > Thank you ! > > On Wed, Apr 24, 2019, 18:10 Strahil <[email protected]> wrote: > > I think 2 small ssds (raid 1 mdadm) can do the job better as ssds have > lower latencies .You can use them both for OS (minimum needed is 60 GB) and > the rest will be plenty for an arbiter. > By the way, if you plan using gluster snapshots - use thin LVM for the > brick. > > Best Regards, > Strahil Nikolov > On Apr 24, 2019 16:20, Leo David <[email protected]> wrote: > > Hello Everyone, > I need to look into adding some enterprise grade sas disks ( both ssd > and spinning ), and since the prices are not too low, I would like to > benefit of replica 3 arbitrated. > Therefore, I intend to buy some smaller disks for use them as arbiter > brick. > My question is, what performance ( regarding iops, througput ) the > arbiter disks need to be. Should they be at least the same as the real data > disks ? > Knowing that they only keep metadata, I am thinking that will not be so > much pressure on the arbiters. > Any thoughts? > > Thank you ! > > > -- > Best regards, Leo David > >
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