Thanks for the detailed explanations Bob!
On Thu, 1 Sep 2005 20:17:37 -0400, Robert Wright <[EMAIL PROTECTED]> wrote:
>I've heard 2nd-hand that DFHSM restrictions may influence your decision
>regarding use of striping and multi-volume data sets for your inventory,
>but that's not my area of expertise. Hopefully, some others who follow
>IBM-MAIN can supply some information on that front.
>
I'm not sure about the restrictions either, but ISTR talking about
them with our storage admin when I requested extended format and
compressed dump data sets. I just looked and ours do only have
one stripe and get allocated with a volume count of 3.
However, in looking at the DFSMShsm Storage Administration Guide - section
2.3.11 Space Management Considerations for Extended Sequential Data Sets,
it certainly seems like migration and recall of multiple-striped data
sets are supported. It lists these restricts for migrate (at least up
to z/OS 1.6):
An extended sequential data set is not migrated if it is very
large (greater than 64K tracks) and cannot fit on one migration
DASD volume. It can be migrated to tape volumes.
(** we migrate dumps directly to ML2 **)
A multistripe extended sequential data set is not migrated if
SETSYS USERDATASETSERIALIZATION is not specified for DFSMShsm.
A multistripe extended sequential data set is not migrated if
it is protected by a RACF discrete profile.
I won't list all the recall considerations documented, but basically
the manual says that single-striped could be recalled as a multiple-stripe
or single-stripe and visa versa depending on the storage class SUSTAINED
DATA RATE value and the availability of the required volumes.
Mark
--
Mark Zelden
Sr. Software and Systems Architect - z/OS Team Lead
Zurich North America and Farmers Insurance Group
mailto: [EMAIL PROTECTED]
Systems Programming expert at http://Search390.com/ateExperts/
Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html
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