Don't agree. With the TS7700 and its 512 tape units, the main factor to limit 
tape (tapeunit) useage has gone. It is fast and suitable for large datasets, 
not only backups etc. but also for DB2 unload files for a reorg process.

And when we stil ran on ESS Dasd with 2Gb connections and the TS7700 on 4Gb 
connections, I sold tape to users of large datasets with the option: Tape is 
twice as fast as Dasd.

Kees.

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf 
Of R.S.
Sent: Tuesday, September 03, 2013 08:05
To: [email protected]
Subject: Re: UNIT=AFF was Re: UNIT=SEP still alive (?)

W dniu 2013-09-02 19:54, Clark Morris pisze:
> On 1 Sep 2013 07:03:23 -0700, in bit.listserv.ibm-main you wrote:
>
>> On 9/1/2013 6:47 AM, Tom Russell wrote:
>>> In the case of multiple steps each allocating one file on the same 
>>> tape, and no AFF parameter used, there was (is?) a significant 
>>> difference between JES2 and JES3.
> For allocating tape drives within a step (and UNIT=AFF is only within 
> a step) UNIT=AFF is still needed to allocate SORTIN and SORTOUT in 
> SORT operations to the same drive in both JES2 and JES3 (or for any 
> other non-concurrent allocations where it is possible to share the 
> drive.
IMHO it's bad idea to use tapes for such operations. Tapes nowadays are for 
backups, dumps, ML2, etc. but not "direct" application use.
My €0.02

--
Radoslaw Skorupka
Lodz, Poland






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