Dear R.S.
Thanks for your answers!
I defined a DC(PSMED) as below:
Recfm . . . . . . . . . . (any valid RECFM combination or blank)
Lrecl . . . . . . . . . . (1 to 32761 or blank)
Override Space . . . . . N (Y or N)
Space Avgrec . . . . . . M (U, K, M or blank)
Avg Value . . . . . (0 to 65535 or blank)
Primary . . . . . . 10 (0 to 999999 or blank)
Secondary . . . . . 10 (0 to 999999 or blank)
Directory . . . . . (0 to 999999 or blank)
Retpd or Expdt . . . . . (0 to 9999, YYYY/MM/DD or blank)
Volume Count . . . . . . 5 (1 to 255 or blank)
Add'l Volume Amount . . . (P=Primary, S=Secondary or blank)
Data Set Name Type . . . . . EXT (EXT, HFS, LIB, PDS, Large or blank)
If Ext . . . . . . . . . . P (P=Preferred, R=Required or blank)
Extended Addressability . . N (Y or N)
Record Access Bias . . . . U (S=System, U=User or blank)
Space Constraint Relief . . . N (Y or N)
Reduce Space Up To (%) . . (0 to 99 or blank)
Dynamic Volume Count . . . (1 to 59 or blank)
Compaction . . . . . . . . . Y (Y, N, T, G or blank)
Spanned / Nonspanned . . . . (S=Spanned, N=Nonspanned or blank)
System Managed Buffering . . (1K to 2048M or blank)
System Determined Blocksize N (Y or N)
EATTR . . . . . . . . . . . . (O=Opt, N=No or blank)
I allocated a dataset using the DC(PSMED).
When I want to release the unused space of the EF dataset by issue 'free' line
command before the dataset name in p.3.4,
The system tell me that 'free' command is Invalid multivolume cmd .
Q:How to release unused space of PS EF
Thanks a lot!
Best Regards,
Jason Cai
发件人： R.S.
发送时间： 2011-04-21 15:24:14
收件人： IBM-MAIN
抄送：
主题： Re: Is DSNTYPE=EXT parameter only used for VSAM
W dniu 2011-04-21 05:49, ibmnew pisze:
> Dear all
>
> The summary is very very clear. Thanks you all for your help!
>
> I want to ask you other questions:
>
> >> when considering DFSMS compression , one should take into account that
> >>it comes with a CPU price tag, so I would not compress everything
> >>indiscriminately (unless CPU is cheaper than DASD for me).
>
>
> Q1. How to determine whether ext-PS((small and large) and VSAM need be
> compressed or not? how to balance DASD with CPU?
> Is there any tools to analyse and monitor it?
It depends on the data, performance requirement, etc. Usually text
reports are good candidates.
> Q2.What situations is that the necessary system resources
> are not available to allocate them?
SMS-managed volume, conteporary DASD unit - that's all you need. The
rest is prehistory.
> Q3. Is EXTENDED ADDRESSABILITY only used for VSAM?
Yes. Other datasets have no addressability to be extended
> Q4. Could I assign all VSAM for applications including< 4G and> 4G to use
> EXTENDED ADDRESSABILITY = yes?
Yes.
> Q5 Is there any disadvantage for ADDRESSABILITY = yes?
There are few restrictions, i.e. lack of AIX for ESDS.
--
Radoslaw Skorupka
Lodz, Poland
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