I also might add that an exclusive enqueue is held by HSM during CDS
backup.  Meaning no other HSM function can process during this time.  If
you opt for multiclustering, keep in mind that some OEM and in-house JCL
may need to change because they will need DDs for each cluster.  MICS
and IDCAMS DCOLLECT are just two I can think of off the top of my head.


Terry Traylor 
charlesSCHWAB 
TIS Mainframe Storage Management 
Remedy Queue: tis-hs-mstg
(602) 977-5154

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of Traylor, Terry
Sent: Wednesday, November 10, 2010 2:58 AM
To: [email protected]
Subject: Re: DFHSM CDSs in extended format

Along with EA, you can still split your CDSs and go multi-clustering.
The advantage: Separate clusters reduce backup processing time by
allowing parallel operations. In addition, if only one cluster is
damaged or lost, the recovery time to forward recover this one cluster
would be reduced.


Terry Traylor
charlesSCHWAB
TIS Mainframe Storage Management
Remedy Queue: tis-hs-mstg
(602) 977-5154

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On
Behalf Of Michael Wickman
Sent: Tuesday, November 09, 2010 3:01 PM
To: [email protected]
Subject: Re: DFHSM CDSs in extended format

Thanks all, I think we will go with the extended addressing route to get
pass the 4GB limit.  And since we are a monoplex, the vsam rls is not an
issue.


Mike Wickman







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