[one-users] Shared File System HA

[Nicolas Diogo]

-------- Original Message --------
Subject: 	Re: [one-users] Shared File System HA
Date: 	Thu, 15 Mar 2012 23:00:27 +0000
From: 	Nicolas Diogo <nicolasdiogo at gmx.com>
To: 	Hans-Joachim Ehlers <HansJoachim.Ehlers at eumetsat.int>



Hi,

apologies for hijacking the thread - is there a specific way to
configure this filesystem to work with OpenNebula?
how should we go about to enable this?

thanks,



On 14/03/12 15:45, Hans-Joachim Ehlers wrote:
> In case we are going to deploy OpenNebula we will use GPFS as our clustered FS ... 
>
> Since it does not answer your question: In case NFS is used you must make sure that:
>
> • The NFS server exports the FS with the “sync” option. Otherwise data corruption could/will during server crash.
> • The NFS client must at least use the mount option “hard“ 
>
> Hth
> Hajo
>
>
>
>
> From: users-bounces at lists.opennebula.org [mailto:users-bounces at lists.opennebula.org] On Behalf Of Marshall Grillos
> Sent: Wednesday, March 14, 2012 4:27 PM
> To: users at lists.opennebula.org
> Subject: [one-users] Shared File System HA
>
> I am debating the differences between Shared and Non-shared file systems for an OpenNebula deployment.
>
> One concern with the shared file system is High Availability.  I am setting up the OpenNebula front-end with connectivity to a storage device.  To avoid the event of a storage device failure (RAID controller, Power, etc) I am looking into setting up a secondary front-end server with attached storage.  I would use NFS to share the storage to each VM Host and setup DRDB for block level replication between each cluster node.  In the event of a storage failure, a failover would occur utilizing heartbeat/pacemaker to the secondary front-end server.
>
> If anyone has tested a similar setup how do the VMs handle the minimal outage required for the failover to occur (the several seconds required to failover to the secondary front-end)?  For a certain duration, wouldn’t the NFS mount be unavailable due to the failover mechanism?
>
> Thanks,
> Marshall
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> Users at lists.opennebula.org
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