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XRC side effect On Primary site.

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New User

Joined: 31 Aug 2005
Posts: 82

PostPosted: Wed Feb 27, 2013 5:31 pm
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We have an XRC session with 590 volume 3390 model 9, which is established on disaster recovery site on 450 k far from our local site. The connection is STM1 150 mbs between local and disaster recovery site.

we are using Cisco MDS 9222i as a switch between ESS on local site and SDM on disaster recovery site with one channel.

I have three question :

1- How can I find consistency group time and the delay time?
2- Why the Batch jobs on primary ESS take double execution time?
3- How can I control the delay time?

Best regards
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Robert Sample

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Joined: 06 Jun 2008
Posts: 8637
Location: Dubuque, Iowa, USA

PostPosted: Wed Feb 27, 2013 5:37 pm
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You are asking questions that cannot be answered on a forum like this as we do not have access to your site and its setup. You need to discuss these questions with whoever set up and supports your site and the DR site; you may have to get your network support group involved as well.
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Pete Wilson

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Joined: 31 Dec 2009
Posts: 540
Location: London

PostPosted: Thu Feb 28, 2013 9:32 pm
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There many factors involved in an XRC setup that can effect things. You shouldn't have it installed if you don't understand what's required and set it up accordingly. There's no substitute for research, so explore the IBM websites for Copy Services, GDPS and related pub's, and ask IBM for help.

e.g. (from what I recall doing this 12 years ago)

Network bandwidth to remote site must be sufficient to take the updates across to the SDM at the remote site otherwise it can get behind

Number of Utility volumes per LCU in the DASD controllers, the type and number of of controllers, number of volumes per LCU, number and type of channels connected, what the CG's are made up of, how you've spread the I/O across controllers and LCU's etc etc.

Proportion of Write activity on Primary volumes. How does it compare to the 150mbps network?

Device Blocking setup

How fast the SDM can unload data on the remote site DASD. Can be constrained by CPU and channels on SDM LPAR's, whether you're running one SDM or coupled XRC's.

How large the cache is on Primary DASD controllers, which can affect the XRC side-file which can impact primary DASD performance, and if you're running Concurrent Copy sessions at the same time as XRC
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