The legend an means the apply delta set is numbered n

This preview shows page 250 - 256 out of 280 pages.

The legend A=N means the Apply Delta set is numbered N. Similarly, R=N+1 means that the number of the Receive Delta Set is N+1. Though the table shown here uses two VMAX family units, the logic works for larger numbers of arrays. 1. In this case, none of the SRDF/A sessions have the “MSC Cleanup Needed” flag set. This occurs when all the Receive Delta sets were incomplete and all were automatically discarded. There is no Cleanup action to take and it is not invoked automatically. 2. Only some arrays have the “MSC Cleanup Needed” flag raised. Also, ALL Apply delta set numbers are the same. This means that some arrays had to discard their incomplete Receive Delta Sets. Consequently, all the arrays needing MSC Cleanup must discard their completely received Delta Sets. 3. All arrays have the “”MSC Cleanup Needed” flag raised. In this case, ALL Apply Delta Set numbers must be the same. This indicates that all Receive Delta Sets are complete and all the Receive Delta Sets can be applied. 4. Only some arrays have their flag raised. Also, one or more arrays with the flag raised has a Receive Delta Set number that matches the Apply cycle number for a array, that discarded its incomplete Receive cycle. This indicates a failure in the middle of a cycle switch. So, all the completely received Receive Delta Sets in the arrays with the flag raised are applied. SRDF/Asynchronous Operations
Image of page 250
57 Copyright 2015 EMC Corporation. All rights reserved. MSC Cleanup can be invoked by any of the following methods: The RDF daemon performs MSC cleanup automatically if it can communicate with the target arrays. The API/CLI automatically performs MSC cleanup during the processing of any RDF control command. User can manually execute MSC cleanup through CLI. The MSC Cleanup Needed status is exported to user-visible displays such as query output. SRDF/Asynchronous Operations
Image of page 251
58 Copyright 2015 EMC Corporation. All rights reserved. SRDF/Asynchronous Operations This demo covers setting SRDF/Asynchronous mode of operation for SRDF device pairs and enabling consistency protection. It also covers configuring Concurrent SRDF with one leg in SRDF/Synchronous mode and the other in SRDF/Asynchronous mode. Configuring and managing SRDF/A Multi-session consistency is covered as well.
Image of page 252
59 Copyright 2015 EMC Corporation. All rights reserved. This lesson covered managing SRDF/A Multi-session Consistency. SRDF/Asynchronous Operations
Image of page 253
60 Copyright 2015 EMC Corporation. All rights reserved. This module covered SRDF/Asynchronous mode of remote replication. Concepts and operations for SRDF/A in single and multi-session modes were presented. SRDF/A resiliency features were also discussed. SRDF/Asynchronous Operations
Image of page 254
1 Copyright 2015 EMC Corporation. All rights reserved.
Image of page 255
Image of page 256

You've reached the end of your free preview.

Want to read all 280 pages?

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors