Okay, my curiosity is peeked.  We have DMX box (EMC) so for our process for
production packs/DR packs we need a total of 3 volumes.  So I have my prod
pack, my Replicate pack and a SNAP (Using FDR Instance).

How does IBM or HDS differ from that.  Which uses less dasd and how is that
done?  I have just been assigned storage management duties and would like to
understand different storage configurations and how each compares to the
other.  

Thanks


Lizette 

<---  Snip
We have used the SnapShot process on a STK V2X ( eariler model ) and we
have used FlashCopy on a HDS9980V.  We have not experienced any subsystem
performance issues with either subsystem.  The issue we did encounter was
trying to
explain to management why we needed 'more DASD' on the HDS9980V vs. the STK
V2X.  As you may know, the answer is the way the STK V2X 'stores' data,
especially as a result of the SnapShot process versus the way IBM, EMC & HDS
'stores' data. I think STK calls it: Log Structured Array.  To me, its
description sounded like 'virtual DASD'.  Maybe 'virtual' anything wasn't
cool 10 years ago when STK designed the Iceberg box.

<---  UnSnip

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