Networker

Re: [Networker] Max server parallelism?

2007-11-12 19:07:29
Subject: Re: [Networker] Max server parallelism?
From: Curtis Preston <cpreston AT GLASSHOUSE DOT COM>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Mon, 12 Nov 2007 19:01:55 -0500
Hmmm...  So perhaps we CAN combine these two into a storage node parellelism 
setting.  If each tape drive has a max sessions setting and each storage node 
has a max active devices setting, then we should be set!



---
W. Curtis Preston
Backup Blog @ www.backupcentral.com
VP Data Protection, GlassHouse Technologies 

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On 
Behalf Of Siobhán Ellis
Sent: Monday, November 12, 2007 3:55 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Max server parallelism?

Curtis,

A good point. However, there is also the not so well known attribute of "max
active devices"within the NSR Storage Node resource. You can only get to it
from nsradmin. It's in 7.4, don't know about 7.3.

It does what it says, limits the maximum number of active devices on a
Storage Node

nsradmin> Print type: NSR Storage Node

Hope that helps

Siobhan

On 13/11/07 10:24 AM, "cpreston" <networker-forum AT BACKUPCENTRAL DOT COM> 
wrote:

> I said:
> 
>> Now, if we could just limit the number of sessions by storage node.
> 
> Siobhán Ellis said:
> 
>> You can, by defining max sessions per device - laborious, but will work"
> 
> And I had to think about that a while.  At first I agreed, but now I've
> changed my mind.  This doesn't completely solve the problem if you're using
> DDS (dynamic drive sharing).  It's very common for a storage node to be
> connected to more tape drives than you want it to use simultaneously.  Suppose
> you have a pool of 20 tape drives that you are sharing among three storage
> nodes and three SAN storage nodes (that back up only their own data).  You may
> want to allow the SAN storage nodes to have access to as many as all 20 of the
> drives, but you probably don't want the regular LAN-based storage nodes to use
> more than two or three at a time.
> 
> You can set max sessions per device, but nothing tells the storage node (or
> SAN storage node) how many devices or sessions it can run simultaneously.  It
> just gets whatever's left over from the server parallelism setting.
> 
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Siobhán

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