IBM Systems Magazine, Mainframe - July/August 2012 - 49

the data set that will be considered for migration. To determine the total free space required on the target volume, add four tracks to the SPACE_USED value to account for JES2 structures that are temporarily stored along with the migrating data. Spool migration looks for in-use tracks in the source volume data set to migrate, from the beginning of the data set to the track identified by SPACE_USED. Now determine the available space on target volume SPOOL5 by issuing the command:
$D SPL(SPOOL5),MIGDATA

volume. The LARGEST_FREE for SPOOL5 must be greater than or equal to SPACE_USED for SPOOL2 plus four tracks. If the criteria is met, then SPOOL5 can become a TARGET VOLUME for SPOOL2 migrated data. Rerun these MIGDATA commands immediately before starting the migration to ensure the space requirements haven’t changed. Figure 1 (page 50) illustrates SPACE_USED and

LARGEST_FREE as part of the overall migration process.
Next, consider improving the performance of your spool migration by reducing the amount of data to migrate and the competition for the volumes involved. One way is to place the source volume in DRAINING state by using the JES2 command $P SPL. Doing so will prevent jobs from

making new allocations to the volume, reducing contention for the volume and the data to be migrated. You can also set the volume as RESERVED. A reserved volume is similar to one in DRAINING state in that work can be selected on the volume but new space cannot be acquired. Reserving the source volume reduces the competition of jobs accessing it. Reserving the target volume keeps processing other than the spool migration from using the free space found earlier with MIGDATA. To reserve SPOOL2, use the command:
$T SPL(SPOOL2),RESERVED

This time, look at the second piece of MIGDATA , LARGEST_FREE, which reports the size in tracks of the largest contiguous free space on the

And for SPOOL5, use:
$T SPL(SPOOL5),RESERVED

Enabling the infrastructure for smarter computing

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ibmsystemsmag.com/mainframe

J U LY/AU G U S T 2 0 12

49


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IBM Systems Magazine, Mainframe - July/August 2012

Table of Contents for the Digital Edition of IBM Systems Magazine, Mainframe - July/August 2012

Editor's Desk: The Taste of Success
Dashboard: Pay by Phone - Current Conditions - Work Without Boundaries - Digital Personalities
IBM Perspective: The Performance of Many, the Efficiency of One
Trends: Why zBX Outperforms DIY When Deploying a Hybrid Infrastructure
Q&A: Accurate TCO Analysis Demonstrates the True Value of System z
IT Today: IBM's Integrated Solution for System z Streamlines Software Delivery
Case Study: Taking Shelter From the Storm: Shelter Insurance employs a measured approach in adopting Linux on zEnterprise 114
Cover Story: Internal Transformation: System z is at the center of initiative, which has saved the company $100 million so far
Feature: Large Memory Tames Big Data: The System z stack evolves to deliver business value from more memory
Tech Corner: A More Effective Comparison Starts With Relative Capacity
Administrator: JES2 Helps Expedite the Relocation of Data Volumes
Solutions: Double-Take Share 5.0 - Vanguard Security and Compliance Solutions - MegaCryption DB - ASG-TMON for DB2 - Reflection Suite for X - Orchestrated IT
Advertiser's Index
Stop Run: Wreck Diving Brings IBMer Face to Face With Lost History
Reference Point - Global Events, Education, Resources for Mainframe
IB Tape Storage
IBM Systems Magazine, Mainframe - July/August 2012 - Intro
IBM Systems Magazine, Mainframe - July/August 2012 - Cover1
IBM Systems Magazine, Mainframe - July/August 2012 - Cover2
IBM Systems Magazine, Mainframe - July/August 2012 - 1
IBM Systems Magazine, Mainframe - July/August 2012 - 2
IBM Systems Magazine, Mainframe - July/August 2012 - 3
IBM Systems Magazine, Mainframe - July/August 2012 - 4
IBM Systems Magazine, Mainframe - July/August 2012 - 5
IBM Systems Magazine, Mainframe - July/August 2012 - Editor's Desk: The Taste of Success
IBM Systems Magazine, Mainframe - July/August 2012 - 7
IBM Systems Magazine, Mainframe - July/August 2012 - Dashboard: Pay by Phone - Current Conditions - Work Without Boundaries - Digital Personalities
IBM Systems Magazine, Mainframe - July/August 2012 - IBM Perspective: The Performance of Many, the Efficiency of One
IBM Systems Magazine, Mainframe - July/August 2012 - Trends: Why zBX Outperforms DIY When Deploying a Hybrid Infrastructure
IBM Systems Magazine, Mainframe - July/August 2012 - 11
IBM Systems Magazine, Mainframe - July/August 2012 - 12
IBM Systems Magazine, Mainframe - July/August 2012 - 13
IBM Systems Magazine, Mainframe - July/August 2012 - 14
IBM Systems Magazine, Mainframe - July/August 2012 - 15
IBM Systems Magazine, Mainframe - July/August 2012 - Q&A: Accurate TCO Analysis Demonstrates the True Value of System z
IBM Systems Magazine, Mainframe - July/August 2012 - 17
IBM Systems Magazine, Mainframe - July/August 2012 - 18
IBM Systems Magazine, Mainframe - July/August 2012 - 19
IBM Systems Magazine, Mainframe - July/August 2012 - 20
IBM Systems Magazine, Mainframe - July/August 2012 - 21
IBM Systems Magazine, Mainframe - July/August 2012 - IT Today: IBM's Integrated Solution for System z Streamlines Software Delivery
IBM Systems Magazine, Mainframe - July/August 2012 - 23
IBM Systems Magazine, Mainframe - July/August 2012 - 24
IBM Systems Magazine, Mainframe - July/August 2012 - 25
IBM Systems Magazine, Mainframe - July/August 2012 - Case Study: Taking Shelter From the Storm: Shelter Insurance employs a measured approach in adopting Linux on zEnterprise 114
IBM Systems Magazine, Mainframe - July/August 2012 - 27
IBM Systems Magazine, Mainframe - July/August 2012 - 28
IBM Systems Magazine, Mainframe - July/August 2012 - 29
IBM Systems Magazine, Mainframe - July/August 2012 - 30
IBM Systems Magazine, Mainframe - July/August 2012 - 31
IBM Systems Magazine, Mainframe - July/August 2012 - Cover Story: Internal Transformation: System z is at the center of initiative, which has saved the company $100 million so far
IBM Systems Magazine, Mainframe - July/August 2012 - 33
IBM Systems Magazine, Mainframe - July/August 2012 - 34
IBM Systems Magazine, Mainframe - July/August 2012 - 35
IBM Systems Magazine, Mainframe - July/August 2012 - 36
IBM Systems Magazine, Mainframe - July/August 2012 - 37
IBM Systems Magazine, Mainframe - July/August 2012 - Feature: Large Memory Tames Big Data: The System z stack evolves to deliver business value from more memory
IBM Systems Magazine, Mainframe - July/August 2012 - 39
IBM Systems Magazine, Mainframe - July/August 2012 - 40
IBM Systems Magazine, Mainframe - July/August 2012 - 41
IBM Systems Magazine, Mainframe - July/August 2012 - 42
IBM Systems Magazine, Mainframe - July/August 2012 - Tech Corner: A More Effective Comparison Starts With Relative Capacity
IBM Systems Magazine, Mainframe - July/August 2012 - 44
IBM Systems Magazine, Mainframe - July/August 2012 - 45
IBM Systems Magazine, Mainframe - July/August 2012 - 46
IBM Systems Magazine, Mainframe - July/August 2012 - 47
IBM Systems Magazine, Mainframe - July/August 2012 - Administrator: JES2 Helps Expedite the Relocation of Data Volumes
IBM Systems Magazine, Mainframe - July/August 2012 - 49
IBM Systems Magazine, Mainframe - July/August 2012 - 50
IBM Systems Magazine, Mainframe - July/August 2012 - 51
IBM Systems Magazine, Mainframe - July/August 2012 - Solutions: Double-Take Share 5.0 - Vanguard Security and Compliance Solutions - MegaCryption DB - ASG-TMON for DB2 - Reflection Suite for X - Orchestrated IT
IBM Systems Magazine, Mainframe - July/August 2012 - 53
IBM Systems Magazine, Mainframe - July/August 2012 - Advertiser's Index
IBM Systems Magazine, Mainframe - July/August 2012 - Stop Run: Wreck Diving Brings IBMer Face to Face With Lost History
IBM Systems Magazine, Mainframe - July/August 2012 - 56
IBM Systems Magazine, Mainframe - July/August 2012 - Cover3
IBM Systems Magazine, Mainframe - July/August 2012 - Cover4
IBM Systems Magazine, Mainframe - July/August 2012 - Reference Point - Global Events, Education, Resources for Mainframe
IBM Systems Magazine, Mainframe - July/August 2012 - BG1
IBM Systems Magazine, Mainframe - July/August 2012 - BG2
IBM Systems Magazine, Mainframe - July/August 2012 - IB Tape Storage
IBM Systems Magazine, Mainframe - July/August 2012 - T2
IBM Systems Magazine, Mainframe - July/August 2012 - T3
IBM Systems Magazine, Mainframe - July/August 2012 - T4
IBM Systems Magazine, Mainframe - July/August 2012 - T5
IBM Systems Magazine, Mainframe - July/August 2012 - T6
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