<div dir="auto"><div>I would go with at least 4 HDDs per host in RAID 10. Then focus on network performance where bottleneck usualy is for gluster.<div dir="auto"><br></div><br><br><div class="gmail_quote"><div dir="ltr">On Sat, Mar 24, 2018, 00:44 Jayme <<a href="mailto:jaymef@gmail.com">jaymef@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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<br></div><div class="elided-text"><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Mar 23, 2018 at 12:03 AM, Manoj Pillai <span dir="ltr"><<a href="mailto:mpillai@redhat.com" target="_blank">mpillai@redhat.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote"><span>On Thu, Mar 22, 2018 at 3:31 PM, Sahina Bose <span dir="ltr"><<a href="mailto:sabose@redhat.com" target="_blank">sabose@redhat.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Mar 19, 2018 at 5:57 PM, Jayme <span dir="ltr"><<a href="mailto:jaymef@gmail.com" target="_blank">jaymef@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">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. <div><br></div><div>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).</div><div><br></div><div>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? </div></div></blockquote></div></div></div></blockquote><div><br></div></span><div>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: <a href="https://review.gluster.org/#/c/19133/" target="_blank">https://review.gluster.org/#/c/19133/</a>.</div><span class="m_2017948436757546550HOEnZb"><font color="#888888"><div><br></div><div>-- Manoj</div></font></span><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div><br></div><div>[Adding gluster-users for inputs here]</div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><br></div><div>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?</div></div></blockquote><div><br></div><div>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.</div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><br></div><div>Thanks!</div><div><br></div></div>
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