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
You opinion/feedback will be really appreciated!
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