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RE: [Xen-users] iscsi vs nfs for xen VMs

Depends on quality of NAS/SAN device. Some of them are more reliable&robust 
that rest of the infrastructure (dual controllers, raid6, multipathing etc.), 
obviously they cost arm&leg. So they SHOULD not totally fail (firmware issues 
are  another thing though). And in that case, even if one owns enterprise grade 
storage, backups (tape, another storage, remote site) are always must. Yeah, if 
storage fails, there will be downtime. You can still have locals disks on xen 
host. So for example you can restore most important Xen guests on the local 
disks from backups and live without live migration until the NAS/SAN issues are 

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
[xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Rudi Ahlers 
Sent: 26 January 2011 09:29
To: jg@xxxxxxxxxxxx
Cc: Dustin Black; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] iscsi vs nfs for xen VMs

On Wed, Jan 26, 2011 at 10:20 AM, Juergen Gotteswinter <jg@xxxxxxxxxxxx> wrote:
> redundant switches
> nic bonding

How, exactly, will redundant switches & NIC bonding help if the NAS
device fails. i.e. it's totally dead? Redundant switches & NIC bonding
will only help you if the network fails - which is much less likely
than the NAS to fail.

Kind Regards
Rudi Ahlers

Website: http://www.SoftDux.com
Technical Blog: http://Blog.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532

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