Re: [ovirt-users] [Gluster-users] GlusterFS performance with only one drive per host?

Do you feel that SSDs are worth the extra cost or am I better off using regular HDDs? I'm looking for the best performance I can get with glusterFS On Fri, Mar 23, 2018 at 12:03 AM, Manoj Pillai <mpillai(a)redhat.com&gt; wrote: > > > On Thu, Mar 22, 2018 at 3:31 PM, Sahina Bose <sabose(a)redhat.com&gt; wrote: > >> >> >> On Mon, Mar 19, 2018 at 5:57 PM, Jayme <jaymef(a)gmail.com&gt; wrote: >> >>> I'm spec'ing a new oVirt build using three Dell R720's w/ 256GB. I'm >>> considering storage options. I don't have a requirement for high amounts >>> of storage, I have a little over 1TB to store but want some overhead so I'm >>> thinking 2TB of usable space would be sufficient. >>> >>> I've been doing some research on Micron 1100 2TB ssd's and they seem to >>> offer a lot of value for the money. I'm considering using smaller cheaper >>> SSDs for boot drives and using one 2TB micron SSD in each host for a >>> glusterFS replica 3 setup (on the fence about using an arbiter, I like the >>> extra redundancy replicate 3 will give me). >>> >>> My question is, would I see a performance hit using only one drive in >>> each host with glusterFS or should I try to add more physical disks. Such >>> as 6 1TB drives instead of 3 2TB drives? >>> >> > It is possible. With SSDs the rpc layer can become the bottleneck with > some workloads, especially if there are not enough connections out to the > server side. We had experimented with a multi-connection model for this > reason: https://review.gluster.org/#/c/19133/. > > -- Manoj > >> >> [Adding gluster-users for inputs here] >> >> >>> Also one other question. I've read that gluster can only be done in >>> groups of three. Meaning you need 3, 6, or 9 hosts. Is this true? If I >>> had an operational replicate 3 glusterFS setup and wanted to add more >>> capacity I would have to add 3 more hosts, or is it possible for me to add >>> a 4th host in to the mix for extra processing power down the road? >>> >> >> In oVirt, we support replica 3 or replica 3 with arbiter (where one of >> the 3 bricks is a low storage arbiter brick). To expand storage, you would >> need to add in multiples of 3 bricks. However if you only want to expand >> compute capacity in your HC environment, you can add a 4th node. >> >> >>> Thanks! >>> >>> >>> _______________________________________________ >>> Users mailing list >>> Users(a)ovirt.org >>> http://lists.ovirt.org/mailman/listinfo/users >>> >>> >> >> _______________________________________________ >> Gluster-users mailing list >> Gluster-users(a)gluster.org >> http://lists.gluster.org/mailman/listinfo/gluster-users >> > > _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users