On Fri, Sep 16, 2016 at 10:23 PM, Gandalf Corvotempesta <
gandalf.corvotempe...@gmail.com> wrote:

> Next year i'll start with our first production cluster.
> I'll put on that many VMs images (XenServer, ProxMox, ...).
>
> Currently I have 3 SuperMicro 6028R-E1CR12T to be used as storage nodes.
>
> I'll put 2 more 10GbT cards on each.
>
> Primary goal is to have MAXIMUM data redundancy and protection.
> we can live with not top-notch performances but data protection must
> be assured all the time in all conditions.
>

Are you willing to take VM snapshots at the right times?


>
> Some questions:
> 1) should I create any raid on each server? If yes, which level and how
> many?
>  - 4 RAID-5 with 3 disks each ? With this i'll create 4 bricks on each
> server
>  - 6 RAID-1 with 2 disks each ? With this i'll create 6 bricks on each
> server (but space wasted is too high)
>  - 2 RAID-6 with 6 disks each? With this i'll create 2 bricks on each
> server
>
> 2) Should I use standard replication (replicate 3) or EC ?
>

Please don't use EC for Random write workload, it is better for extending
write workload at the moment. Replica 3/Arbiter is what I would suggest.


>
> 3) Our servers has 2 SSD in the back. Can I use this as tiering ?
>

> 4) Our servers has 1 SSD inside (not hotplug) for the OS. What would
> happens in case of a crash of this SSD ? Is gluster able to recover
> the whole failed node ?
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-- 
Pranith
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