Re: Have you enabled MIDAW and zHPF? If not, why not?

2012-06-23 Thread R.S. 

W dniu 2012-06-22 16:47, Thomas Conley pisze:

I'd like to take a private survey to determine which sites have
enabled both MIDAW and zHPF, or if you haven't enabled either or
both, why.  It's come to my attention that some sites may not have
enabled these options.  In the case of MIDAW, you have to take action
to place MIDAW=NO into IECIOSxx, but for zHPF, you have to turn it on
with ZHPF=YES in IECIOSxx.  Both options can significantly lower your
I/O overhead and increase throughput, and I haven't come up with a
reason for not enabling them.


MIDAW, zHPF, HYPERPAV are enabled on every DASD which support it.
No reasons found to not enable any of the features.


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Radoslaw Skorupka
Lodz, Poland








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Re: Have you enabled MIDAW and zHPF? If not, why not?

2012-06-22 Thread Mark Zelden 
On Fri, 22 Jun 2012 09:47:32 -0500, Thomas Conley pinnc...@rochester.rr.com 
wrote:

I'd like to take a private survey to determine which sites have enabled both 
MIDAW and zHPF, or if you haven't enabled either or both, why.  It's come to 
my attention that some sites may not have enabled these options.  In the case 
of MIDAW, you have to take action to place MIDAW=NO into IECIOSxx, but for 
zHPF, you have to turn it on with ZHPF=YES in IECIOSxx.  Both options can 
significantly lower your I/O overhead and increase throughput, and I haven't 
come up with a reason for not enabling them.

Please respond to me privately off-list.  I will keep your information 
confidential.  I am thinking about presenting a recommedation to turn on both 
options for the Bit Bucket at SHARE in Anaheim.


I think you should include HYPERPAV in that same survey.   I think the reason
you will find people don't have zHPF and/or HIPERPAV active is they are 
not free HW features.  I don't know if the vendors charge for MIDAW or
not, or if it just takes the proper HW / code levels to support it.

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