Indeed you are correct.  Though isn't that collocation going to go out of 
the window on the 2nd days migrations?  The daily chunks of data will be 
together, but all node data would be on the same tape until it gets 
filled.

I cannot agree more on you last sentence! :)

Steven 

Steven Langdale
Global Information Services
EAME SAN/Storage Planning and Implementation
( Phone : +44 (0)1733 584175
( Mob: +44 (0)7876 216782
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+ Email: steven.langdale AT cat DOT com

 



Richard Sims <rbs AT BU DOT EDU> 
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
17/12/2009 22:47
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"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>


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Re: [ADSM-L] collocation increases tape mounts while backup




Caterpillar: Confidential Green Retain Until: 16/01/2010 



On Dec 17, 2009, at 5:31 PM, Steven Langdale wrote:

> In that case you must be using collocation (albeit  by accident).

Not really...  Remember that, within Migpr, migration operates
serially by node, and thus you get a certain amount of same-node data
clumped together on sequential media.  It's not collocation, but
affords some temporal node data co-residency which incidentally helps
restoral times in the short term.  Of course, one should architect
storage utilization, and not depend upon happenstance.

    Richard Sims