1) RAID5 may be a performance hit

2) I'd be inclined to do this as JBOD by creating a distributed disperse volume on each server.  Something like

echo gluster volume create dispersevol disperse-data 5 redundancy 2 \
$(for SERVER in a b c; do for BRICK in $(seq 1 5); do echo -e "server${SERVER}:/brick/brick-${SERVER}${BRICK}/brick \c"; done; done)

3) I think the above

4) Gluster does support tiering, but IIRC you'd need the same number of SSD as spindle drives.  There may be another way to use the SSD as a fast cache. 

Where are you putting the OS?

Hope I understood the question...

Thanks

On Sun, Aug 6, 2017 at 10:49 PM, Moacir Ferreira <moacirferreira@hotmail.com> wrote:

I am willing to assemble a oVirt "pod", made of 3 servers, each with 2 CPU sockets of 12 cores, 256GB RAM, 7 HDD 10K, 1 SSD. The idea is to use GlusterFS to provide HA for the VMs. The 3 servers have a dual 40Gb NIC and a dual 10Gb NIC. So my intention is to create a loop like a server triangle using the 40Gb NICs for virtualization files (VMs .qcow2) access and to move VMs around the pod (east /west traffic) while using the 10Gb interfaces for giving services to the outside world (north/south traffic).


This said, my first question is: How should I deploy GlusterFS in such oVirt scenario? My questions are:


1 - Should I create 3 RAID (i.e.: RAID 5), one on each oVirt node, and then create a GlusterFS using them?

2 - Instead, should I create a JBOD array made of all server's disks?

3 - What is the best Gluster configuration to provide for HA while not consuming too much disk space?

4 - Does a oVirt hypervisor pod like I am planning to build, and the virtualization environment, benefits from tiering when using a SSD disk? And yes, will Gluster do it by default or I have to configure it to do so?


At the bottom line, what is the good practice for using GlusterFS in small pods for enterprises?


You opinion/feedback will be really appreciated!

Moacir


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