WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

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

To: Matej Zary <matej.zary@xxxxxxxxx>
Subject: Re: [Xen-users] iscsi vs nfs for xen VMs
From: Rudi Ahlers <Rudi@xxxxxxxxxxx>
Date: Wed, 26 Jan 2011 10:55:41 +0200
Cc: "jg@xxxxxxxxxxxx" <jg@xxxxxxxxxxxx>, Dustin Black <vantage@xxxxxxxxxxxx>, "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Wed, 26 Jan 2011 00:57:30 -0800
Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=softdux.com; h=MIME-Version:Reply-To:In-Reply-To:References:From:Date:Message-ID:Subject:To:Cc:Content-Type:Content-Transfer-Encoding:X-Assp-ID:X-Assp-Version:X-Source:X-Source-Args:X-Source-Dir; b=hLkrhrGdLlhhFZghBmRh7iqlbkWLorx/huG0LsexcglHqA4mJfboIU8v8qIWH2sdcesy+vqnf+66BuXqFuOkV5jVlDL0mNfygDfPqgTPuHdOCv4AeF4Eqyms5Yvfghc6;
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <5DB0519124BB3D4DBEEB14426D4AC7EA18BFE6FF56@xxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <994429490908070648s69eed40eua19efc43c3eb85a7@xxxxxxxxxxxxxx> <7bc80d500908070700s7050c766g4d1c6af2cd71ea89@xxxxxxxxxxxxxx> <994429490908070711q4c64f92au9baa6577524e5c5d@xxxxxxxxxxxxxx> <3463f63d0908070726y630d320u3e3f1f1cae9b34a4@xxxxxxxxxxxxxx> <sig.0007322cfd.AANLkTi=2S3bKf6jv9BbqYMbkWFbjJTrpYh8GK2EGXGns@xxxxxxxxxxxxxx> <4D3FD940.1090000@xxxxxxxxxxxx> <AANLkTi=J-s+oc44wY-N_wQ+wQr=VhnG-EK48QYpx7y-Y@xxxxxxxxxxxxxx> <5DB0519124BB3D4DBEEB14426D4AC7EA18BFE6FF56@xxxxxxxxxxxxxxxxxxxxx>
Reply-to: rudi@xxxxxxxxxxx
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
On Wed, Jan 26, 2011 at 10:44 AM, Matej Zary <matej.zary@xxxxxxxxx> wrote:
> 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 solved.
>
> Matej
> ________________________________________


Well, that's the problem. We have (had, soon to be returned) a so
called "enterprise SAN" with dual everything, but it failed miserably
during December and we ended up migrating everyone to a few older NAS
devices just to get the client's websites up again (VPS hosting). So,
just cause a SAN has dual PSU's, dual controllers, dual NIC's, dual
HEAD's, etc doesn't mean it's non-redundant.

I'm thinking of setting up 2 independent SAN's, of for that matter
even NAS clusters, and then doing something like RAID1 (mirror) on the
client nodes with the iSCSI mounts. But, I don't know if it's feasible
or worth the effort. Has anyone done something like this ?


-- 
Kind Regards
Rudi Ahlers
SoftDux

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

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users