<p dir="ltr">Hi,</p>
<p dir="ltr">Are you planing to use oVirt or plain KVM or openstack?</p>
<p dir="ltr">I would recommend you to use gluster v6.1 as it is the latest stable version and will have longer support than the older versions.</p>
<p dir="ltr">Fuse vs libgfapi - use the latter as it has better performance and less overhead on the host.oVirt does supports both libgfapi and fuse.</p>
<p dir="ltr">Also, use replica 3 because you will have better read performance compared to replica 2 arbiter 1.</p>
<p dir="ltr">Sharding is a tradeoff between CPU (when there is no sharding , gluster shd must calculate the offset of the VM disk) and bandwidth (whole shard is being replicated despite even 512 need to be synced).</p>
<p dir="ltr">If you will do live migration - you do not want to cache in order to avoid corruption.<br>
Thus oVirt is using direct I/O.<br>
Still, you can check the gluster settings mentioned in Red Hat documentation for Virt/openStack .</p>
<p dir="ltr">Best Regards,<br>
Strahil Nikolov</p>
<div class="quote">On Jun 20, 2019 13:12, Cristian Del Carlo <cristian.delcarlo@targetsolutions.it> wrote:<br type='attribution'><blockquote class="quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi,</div><br />I'm testing glusterfs before using it in production, it should be used to store vm for nodes with libvirtd.<br /><br /><div>In production I will have 4 nodes connected with a dedicated 20gbit/s network.</div><div><br /></div><div>Which version to use in production on a centos 7.x? Should I use Gluster version 6?</div><div><br /></div><div>To make the volume available to libvirtd the best method is to use FUSE?</div><div><br /></div><div>I see that stripped is deprecated. Is it reasonable to use the volume with 3 replicas on 4 nodes and sharding enabled? <br /></div><div></div><div>Is there convenience to use sharding volume in this context? I think could positive inpact in read performance or rebalance. Is it true?<br /></div><div><br /></div>In the vm configuration I use the virtio disk. How is it better to set the disk cache to get the best performances none, default or writeback?<div><br />Thanks in advance for your patience and answers.</div><div><br /></div><div>Thanks,<br /></div><div><div dir="ltr"><div dir="ltr"><div><br /></div><div><b><font color="#990000"><i><br /></i></font></b></div><div><b><font color="#990000"><i>Cristian Del Carlo</i></font></b><br /></div><div></div></div></div></div></div>
</blockquote></div>