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

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 >