[ovirt-users] recommendations for best performance and reliability

[FERNANDO FREDIANI]

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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