I dug into the doc once again for more info on Mark's reference to
'striping'. I find this comment in Diagnosis: Tools and Service Aids:
"Extended format data sets are supported by z/OS V1R6 and later releases.
Extended format sequential data sets can hold 16,777,215 blocks. If you use
a maximum block size, 29120 bytes, approximately 488 GB can fit. You cannot
use striping or compression options for extended format sequential data
sets. You must use the guaranteed free space option to require DFSMS to
reserve space at the time that the data set is created."
On the other hand:
"Large format data sets are supported by z/OS V1R7 and later releases.
Large format (DSNTYPE=LARGE) data sets can span 16,777,215 tracks. If you
use a maximum block size, 29120 bytes, approximately 768 GB can fit. "
I have two Mod-9 volumes with SYS1.SADMP spanning both as DSNTYPE=LARGE for
a total of 20,032 cylinders. I use the AMDSADDD REXX utility to enable SAD
to write data to both volumes in a way I understood as 'logical striping'
(my term).
Is there a better option?
Mark Zelden
<[EMAIL PROTECTED]
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<[EMAIL PROTECTED] Subject
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Please respond to
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<[EMAIL PROTECTED]
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On Thu, 20 Mar 2008 13:41:26 -0700, Skip Robinson
<[EMAIL PROTECTED]>
wrote:
<snip>
The SADUMP performance with striping is amazing!
Mark
--
Mark Zelden
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