[Users] Gluster question

[Itamar Heim]

On 02/06/2014 04:29 AM, Maurice James wrote:
> OK I think I got it now. What I meant by NFS on each host was. In ovirt
> you can set up an NFS storage domain on each host and have the available
> to all hosts in the cluster

but then you have no replication/redudnacy in case a host fails, while 
with gluster with replication you don't care (well less) if a host fails?

>
> *From:*Andrew Lau [mailto:andrew at andrewklau.com]
> *Sent:* Wednesday, February 05, 2014 9:25 PM
> *To:* Maurice James
> *Cc:* users
> *Subject:* Re: [Users] Gluster question
>
> I'm not sure what you mean by NFS each host, but you'll need some way to
> at least ensure the data is available. Be that be replicated gluster or
> a centralized SAN etc.
>
> On Thu, Feb 6, 2014 at 1:21 PM, Maurice James <midnightsteel at msn.com
> <mailto:midnightsteel at msn.com>> wrote:
>
>     Hmm. So in that case would I be able to drop the Gluster setup and
>     use NFS each host and make sure power fencing is enabled? Will that
>     still achieve fault tolerance, or is a replicated gluster still
>     required?
>
>     *From:*Andrew Lau [mailto:andrew at andrewklau.com
>     <mailto:andrew at andrewklau.com>]
>     *Sent:* Wednesday, February 05, 2014 9:17 PM
>     *To:* Maurice James
>     *Cc:* users
>     *Subject:* Re: [Users] Gluster question
>
>     There was another recent post about this but a sum up was:
>
>     You must have power fencing to support VM HA otherwise they'll be an
>     issue with the engine not knowing whether the VM is still running
>     and not bring it up on a new host to avoid data corruption. Also
>     make sure you have your quorum setup properly based on your
>     replication scenario so you can withstand 1 host being lost.
>
>     I don't believe they'll "keep running" in a sense because of the
>     host being lost, but they would restart on another host. At least
>     that's what I've noticed in my case.
>
>     On Thu, Feb 6, 2014 at 1:04 PM, Maurice James <midnightsteel at msn.com
>     <mailto:midnightsteel at msn.com>> wrote:
>
>         I currently have a new setup running ovirt 3.3.3. I have a
>         Gluster storage domain with roughly 2.5TB of usable space.
>           Gluster is installed on the same systems as the ovirt hosts.
>         The host break down is as follows
>
>         Ovirt DC:
>
>         4 hosts in the cluster. Each host has 4 physical disks in a RAID
>         5. Each disk is 500GB. With the OS installed and configured I
>         end up with 1.2TB of usable space left for my data volume
>
>         Gluster volume:
>
>         4 bricks with 1.2TB of space per brick (Distribute Replicate
>         leaves me with about 2.5TB in the storage domain)
>
>         Does this setup give me enough fault tolerance to survive losing
>         a host and have my HA vm automatically move to an available host
>         and keep running??
>
>
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