Re: [Networker] How to query for whether a volume is mounted?

2008-05-06 13:42:20
Subject: Re: [Networker] How to query for whether a volume is mounted?
From: MIchael Leone <Michael.Leone AT PHA.PHILA DOT GOV>
Date: Tue, 6 May 2008 13:39:08 -0400
Davina Treiber <Davina.Treiber AT DOT uk> wrote on 05/06/2008 

> MIchael Leone wrote:
> > Davina Treiber <Davina.Treiber AT DOT uk> wrote on 05/06/2008 
> > PM:
> > 
> > On Windows, you define the cluster resource (i.e., the disk drive, 
> > is on my SAN), and then assign it to a virtual server. This virtual 
> > is then "owned" by a specific physical node. And only the "owner" of 
> > resource sees it.
> > 
> > So if "SAN2" has a resource of drive X:, and it's hosted on 
> > then node only ADMNSAN002 sees it.
> Is it not possible to define the device as "rd=SAN2://X:" ?

Dunno; never tried that. :-) As I say, our configuration was set by EMC, 
who came out and installed/configured everything originally, last year. 
And they state that Best Practices is that each physical node have it's 
own Storage Node license and it's own disk space, allocated from the SAN.

I get the impression (but only an impression, as I haven't asked EMC) that 
NW doesn't work this way on Windows. That for some reason, the disk space 
must be defined and labeled from each physical node separately, else NW 
doesn't use/see it properly. I personally would love to do it from the 
virtual server (SAN2, in this example), but I don't have a spare cluster, 
spare disk space, or spare storage node licenses to test with.

If EMC is listening, perhaps they could expound on why they advocate that 
each node must have it's own disk space and storage node license, in a 
Windows cluster, as opposed to just needing it for the virtual server(s) 
defined on the cluster. There may be some OS specific reason.

> > So, when the virtual 
> > server moves from one to the other, I have to manually dismount the 
> > NetWorker defined volume for the node, and then mount the other 
> > defined volume, for the other node.
> What happens if the cluster fails over in the night? Do you get paged 
> out or do your backups just fail?

It fails. :-( (as it happened last night) We're between monitoring 
programs at the moment (don't ask), so I didn't get paged to connect 
remotely, and dismount/mount NW volumes, and restart the backup job.

Michael Leone
Network Administrator, ISM
Philadelphia Housing Authority
2500 Jackson St
Philadelphia, PA 19145
Tel:  215-684-4180
Cell: 215-252-0143
<mailto:michael.leone AT pha.phila DOT gov>

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