Re: Async Duplexing of Locks Structures

[MK Kwan]

Thank you for your comments.

From: Timothy Sipples
Sent: Sunday, 15 July 2018 11:58 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Async Duplexing of Locks Structures

MK Kwan asked:
>Does async duplexing of Lock structures help on improving
>the response?

Yes, it should, but how much is workload dependent. There's a performance
guide involving some SAP-related workloads available here:

https://www.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP102720

Ideally, you would test your proposed/desired configuration in a
well-crafted benchmark using a distance simulator, or using a "suitcase"
containing 60 Km of fiber cabling.

If you discover that your workloads are misbehaving at that distance then
you have a couple choices, broadly speaking: (a) reduce the distance, (b)
see if you can adjust the workloads and their behaviors, and/or (c) have a
look at IBM GDPS Active offerings to see if they address your business
resilience requirements at or beyond the distance you need. For item (a)
sometimes you can get some help if you position a CF halfway between sites.


Timothy Sipples
IT Architect Executive, Industry Solutions, IBM Z & LinuxONE
E-Mail: sipp...@sg.ibm.com

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Async Duplexing of Locks Structures

[MK Kwan]

Hello Group

Is someone involved in running a stretched sysplex across a distance of 60km 
with db2 of at least 2-way data sharing? I read from some IBM documentation 
that as the distance increases, the is also increase in the  CF link response. 
And duplex Lock structures is the one that will have the most significant delay 
comparative to other type of structures. Does async duplexing of Lock 
structures help on improving the response? 

Thanks for any thoughts and comments.

MK Kwan

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