ADSM-L

Re: EXPORT TO SERVER differences in sizes of moved data ?

2005-10-24 10:59:25
Subject: Re: EXPORT TO SERVER differences in sizes of moved data ?
From: David McClelland <david.mcclelland AT UK.IBM DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Mon, 24 Oct 2005 15:58:54 +0100

Hi Zoltan,

I've witnessed this too in the past when using EXPORT NODE and comparing occupancy between the two servers - I might expect the source server's data to occupy more space, and the target to occupy less space if, on the source server, data has been 'maturing' there and there might be some extra space taken by expired objects contained within larger aggregates (in the TSM internal storage sense) - during the export of the node's data, this effect would have been negated as the data is contained within newly created aggregates on the target server.

It seems like a reasonable explanation to me - anyone with a more intricate knowledge of TSM aggregation internals able to offer a more detailed reasoning?

Rgds,
David McClelland
Storage and Systems Management Specialist
IBM Tivoli Certified Deployment Professional (ITSM 5.2)
SSO UK Service Delivery – Storage Services
IBM Global Services – IBM United Kingdom




Zoltan Forray/AC/VCU <zforray AT VCU DOT EDU>
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24/10/2005 15:23
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[ADSM-L] EXPORT TO SERVER differences in sizes of moved data ?





I just moved a node from an MVS/zOS TSM server we are phasing out, to our
AIX TSM server.

I am wondering why the occupancy sizes are different. The file counts are
the same.

MVS TSM server  (v5.2.4.2)

Backup Files    1,027,310
Backup Size     383.2GB

Archive Files   732,454
Archive Data    39.5GB


AIX TSM server (v5.3.1.3)

Backup Files    1,027,310
Backup Size     377.7GB

Archive Files   732,454
Archive Data    39.3GB


Difference      422.8GB (MVS) vs 417.0GB (AIX)

I have 6TB to move and am a little concerned about these "losses" !

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