[ovirt-users] recommendations for best performance and reliability

[Eduardo Mayoral]

Just curious. Would Gluster with a JBOD configuration make sense in this
scenario? Maybe with dm-cache on the SSDs?

In general, does a Gluster JBOD configuration make sense as a backend
for oVirt?

Eduardo Mayoral Jimeno (emayoral at arsys.es)
Administrador de sistemas. Departamento de Plataformas. Arsys internet.
+34 941 620 145 ext. 5153

On 13/11/17 12:47, FERNANDO FREDIANI wrote:
>
> 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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>
>
>
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