Helli Rudi
Nice specs.
I wouldn't use GlusterFS for this setup with the third server in a
different location. Just have this server as an Standalone and replicate
the VMs there. You won't have real time replication, but much less
hassle and probably to have constant failures, specially knowing you
have a wireless link.
For the SSDs I have been using bcache with success. Relatively simple to
setup and pretty good performance.
For your specs as you have 4 mechanical disks I would recommend you to
have a RAID 5 between them (4 disks is my limit for RAID 5) and a RAID 0
made of SSDs for the bcache device. If the RAID 0 fails for any reason
it will fall back directly to the mechanical disks and you can do
maintenance on the Node doing live migration in order to replace the
failed disks.
However as you have you have 2 remaining server to create your cluster
you may need to consider GlusterFS on the top of this RAID to have the
replication and Highavaibility.
Hope it helps.
Fernando
On 13/11/2017 08:03, Rudi Ahlers wrote:
Hi,
Can someone please give me some pointers, what would be the best setup
for performance and reliability?
We have the following hardware setup:
3x Supermicro server with following features per server:
128GB RAM
4x 8TB SATA HDD
2x SSD drives (intel_ssdsc2ba400g4 - 400GB DC S3710)
2x 12 core CPU (Intel(R) Xeon(R) CPU E5-2650 v4 @ 2.20GHz
Quad port 10Gbe Inter NIC
2x 10GB Cisco switches (to isolate storage network from LAN)
One of the servers will be in another office, with a 600Mb wireless
link for Disaster Recovery.
What is recommended for the best setup in terms of redundancy and speed?
I am guessing GlusterFS with a Distributed Striped Replicated Volume
across 3 of the servers.
For added performance I want to use the SSD drives, perhaps with dm-cache?
Should I combine the 4x HDD's using LVM on each host node?
What about RAID 6?
Virtual Machines will then reside on the oVirt Cluster and any one of
the 3 host nodes can fail, or any single HDD can fail and all should
still work, right/?
--
Kind Regards
Rudi Ahlers
Website: http://www.rudiahlers.co.za
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