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Agreed on performance, same same.

Too many does stress everything and may slow other jobs. However if this is the only thing on the system multi-thread until it runs out of gas to get the maximum work down in the minimum time. In admittedly extreme case we took a 3 day process and ran it in an hour by multithreading 32 at once in a massive memory pool rather than sequential in the interactive pool.

Personally I do CLRLIB only because if the library is in a library list somewhere CLRLIB works while DLTLIB fails. This may not be an issue for you.


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On 1/13/2016 1:13 PM, Steinmetz, Paul wrote:

Steve,

We do a similar process using BRMS, on a as needed basis.
We do DLTLIB, and let RSTLIBRM recreate the libraries.
The performance will depend on your DASD subsystem.
We have 10k spinny with 5913 controllers.
20+ libraries equating to about 1tb takes about 1 hour.
If we run multiple deletes at the same time, the disk subsystem is stressed, everything suffers.
I don't think you will see much difference between a CLRLIB or DLTLIB.

Paul


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Steve Pavlichek
Sent: Wednesday, January 13, 2016 1:02 PM
To: Midrange List
Subject: Clear or Delete Library

Is there a performance difference between a CLRLIB and DLTLIB? I have a customer who is refreshing over 10TB of data from PROD to DEV using BRMS save/restore and is needing to get the process done quicker.

They are submitting CLRLIBs to batch and are running multiple jobs concurrently. Would single threading these help at all?

Any other suggestions?

Thanks
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