[ovirt-users] moving storage away from a single point of failure

[Daniel Helgenberger]

On 18.09.2015 23:04, Robert Story wrote:
> Hi,

Hello Robert,

> 
> I'm running oVirt 3.5 in our lab, and currently I'm using NFS to a single
> server. I'd like to move away from having a single point of failure.

In this case have a look at iSCSI or FC storage. If you have redundant contollers and switches
the setup should be reliable enough?

> Watching the mailing list, all the issues with gluster getting out of sync
> and replica issues has me nervous about gluster, plus I just have 2
> machines with lots of drive bays for storage.

Still, I would stick to gluster if you want a replicated storage:
 - It is supported out of the box and you get active support from lots of users here
 - Replica3 will solve most out of sync cases
 - I dare say other replicated storage backends do suffer from the same issues, this is by design.

Two things you should keep in mind when running gluster in production:
 - Do not run compute and storage on the same hosts
 - Do not (yet) use Gluster as storage for Hosted Engine

> I've been reading about GFS2
> and DRBD, and wanted opinions on if either is a good/bad idea, or to see if
> there are other alternatives.
> 
> My oVirt setup is currently 5 nodes and about 25 VMs, might double in size
> eventually, but probably won't get much bigger than that.

In the end, it is quite easy to migrate storage domains. If you are satisfied with your lab
setup, put it in production and add storage later and move the disks. Afterwards, remove old
storage domains.

My to cent with gluster: It runs quite stable since some time now if you do not touch it.
I never had issues when adding bricks, though removing and replacing them can be very tricky.

HTH,

> 
> 
> Thanks,
> 
> Robert
> 

-- 
Daniel Helgenberger
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