IBM Z and LinuxONE IBM Z

We have an application that uses EXCP channel programs to transfer data to and from storage. We would like to make use of zHPF, where the target storage medium supports it, for improved performance. I have been looking for documentation and although I can find it for zHPF in general I have not been able to find anything that relates to the actual instructions supported by the storage devices, such as the DS8000. Can anyone point me at suitable documentation that will help us make progress with zHPF?

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Chris Hill
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I think you'll find that the channel commands supported by DS8000 hardware are closely guarded IBM secrets. My (admittedly minimal) understanding is that if you have enabled zHPF support in z/OS then the operating system will automatically convert standard channel programs into "transport mode" channel programs on-the-fly (for hardware that supports it) so you should not have to change your programs. The opinion of an IBM subject matter expert should take precedence over mine though!

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Andrew Armstrong
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Original Message:
Sent: Tue July 20, 2021 05:41 AM
From: Chris Hill
Subject: zHPF documentation

We have an application that uses EXCP channel programs to transfer data to and from storage. We would like to make use of zHPF, where the target storage medium supports it, for improved performance. I have been looking for documentation and although I can find it for zHPF in general I have not been able to find anything that relates to the actual instructions supported by the storage devices, such as the DS8000. Can anyone point me at suitable documentation that will help us make progress with zHPF?

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Chris Hill
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Original Message:
Sent: 7/21/2021 3:57:00 AM
From: Andrew Armstrong
Subject: RE: zHPF documentation

I think you'll find that the channel commands supported by DS8000 hardware are closely guarded IBM secrets. My (admittedly minimal) understanding is that if you have enabled zHPF support in z/OS then the operating system will automatically convert standard channel programs into "transport mode" channel programs on-the-fly (for hardware that supports it) so you should not have to change your programs. The opinion of an IBM subject matter expert should take precedence over mine though!

------------------------------
Andrew Armstrong
------------------------------

Original Message:
Sent: Tue July 20, 2021 05:41 AM
From: Chris Hill
Subject: zHPF documentation

We have an application that uses EXCP channel programs to transfer data to and from storage. We would like to make use of zHPF, where the target storage medium supports it, for improved performance. I have been looking for documentation and although I can find it for zHPF in general I have not been able to find anything that relates to the actual instructions supported by the storage devices, such as the DS8000. Can anyone point me at suitable documentation that will help us make progress with zHPF?

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Chris Hill
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What I am really looking for is something that will help us map our CCWs in our EXCP channel program into the appropriate TCWs for zHPF.

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Chris Hill
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Original Message:
Sent: Wed July 21, 2021 10:38 AM
From: Jim Elliott
Subject: zHPF documentation

There is this doc, not sure if it helps

 

https://www.ibm.com/docs/en/zos/2.4.0?topic=program-zhpf-channel

 

Jim Elliott | Senior IT Consultant

GlassHouse Systems Inc.

 

Original Message:
Sent: 7/21/2021 3:57:00 AM
From: Andrew Armstrong
Subject: RE: zHPF documentation

I think you'll find that the channel commands supported by DS8000 hardware are closely guarded IBM secrets. My (admittedly minimal) understanding is that if you have enabled zHPF support in z/OS then the operating system will automatically convert standard channel programs into "transport mode" channel programs on-the-fly (for hardware that supports it) so you should not have to change your programs. The opinion of an IBM subject matter expert should take precedence over mine though!

------------------------------
Andrew Armstrong

Original Message:
Sent: Tue July 20, 2021 05:41 AM
From: Chris Hill
Subject: zHPF documentation

We have an application that uses EXCP channel programs to transfer data to and from storage. We would like to make use of zHPF, where the target storage medium supports it, for improved performance. I have been looking for documentation and although I can find it for zHPF in general I have not been able to find anything that relates to the actual instructions supported by the storage devices, such as the DS8000. Can anyone point me at suitable documentation that will help us make progress with zHPF?

------------------------------
Chris Hill
------------------------------