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Chapter 14. Data migration in zSeries environments 299
parameter. When the target volume is larger than the source volume it is usually necessary to
adjust the VTOC size on the target volume with the ICKDSF REFORMAT
REFVTOC
command to make the entire volume size accessible to the system.
DFSMSdss also provides full DUMP and full RESTORE commands. With the DUMP
command an entire volume is copied to tape cartridges and can then be restored from tape
via the RESTORE command to the new source volume. During that time all data sets on that
volume are not available to the application in order to keep data consistency between when
the DUMP is run and when the RESTORE command completes. The advantage of this
method is that it creates a copy which offers fail-back capabilities. When source and target
disk servers are not available at the same time for migration, this might be a feasible
approach to migrate the data over to the new hardware.
DFSMSdss is optimized to read and write data sequentially as fast as possible. Besides
optimized channel programs, which always use the latest enhancements the hardware and
microcode provides, DFSMSdss also allows a highly parallel I/O pattern, which is achieved
either through the PARALLEL keyword within a single job/step or you can submit more than
one DFSMSdss job and run several DFSMSdss jobs in parallel.
TDMF and FDRPAS provide concurrent full volume migration capabilities, which are best
described as remote copy functions for migration based on software that allows a controlled
switch-over to the new target volume. As a general rule, these might be considered when the
number of volumes to be migrated is in the hundreds rather than in the range of thousands of
volumes to be migrated. With large migration tasks, the number of volumes has to be broken
down to smaller volume sets so that the migration can happen in a controlled fashion. This
lengthens the migration period, so if possible, other approaches might be considered.
Both software products are usually associated with fees or service-based fees. When the
number of volumes is in the range of up to a few hundred, then standard software like
DFSMSdss is an option. But DFSMSdss-based migration does not automatically switch over
to the target volumes and usually requires some weekend efforts to complete. DFSMSdss is
standard software and part of z/OS, so there are no extra costs for software.
The choice of which software approach to take depends on the business requirements and
service levels which the data center has to follow. The least disruptive approach is to provide
software packages that switch in a controlled and transparent manner over to the target
device, like TDMF and FDRPAS do. When brief service interruptions can be tolerated, then
the standard software is still a popular solution.
14.2.2 Software- and hardware-based data migration
Piper z/OS (an IBM IGS service) and z/OS Global Mirror are tools for data migration that are
based on software, which in turn relies on specific hardware or microcode support. This
section outlines these two popular approaches to migrate data.
Data migration with Piper for z/OS
IBM offers a migration service using the Piper tool, which is a combination of FDRPAS as the
software used in a migration server (which is part of the service offering) that is connected to
the customer configuration during the migration.
- The IBM TotalStorage Storage 1
- DS8000 Series:s: 1
- Contents ix 11
- Contents xi 13
- Floating spares 100
- Hot plugable DDMs 100
- 4.7 Power and cooling 101
- 4.7.1 Building power loss 102
- 4.8 Microcode updates 103
- 4.9 Management console 104
- 4.10 Summary 104
- Virtualization concepts 105
- LPAR Hypervisor 107
- Storage enclosure pair 108
- Loop 1 Loop 2 109
- 5.3.3 Ranks 110
- 5.3.4 Extent pools 111
- Extent Pool CKD0 112
- Extent Pool CKD1 112
- Extent Pool FBtest 112
- Extent Pool FBprod 112
- 5.3.5 Logical volumes 113
- Allocate a 3 GB LUN 115
- Logical 115
- 3 GB LUN 115
- 2.9 GB LUN 115
- LSS X'17' 117
- LSS X'18' 117
- DB2-test 117
- 5.3.7 Volume access 118
- Host attachment 119
- Volume group 119
- 5.3.9 Placement of data 121
- Host LVM volume 122
- Model Naming Conventions 126
- 6.1.2 DS8100 Model 921 127
- 6.2 Model comparison 130
- 6.3 Designed for scalability 131
- Adding DDMs 132
- Future plan 132
- 2-way I/O controllers 133
- 4-way I/O controllers 134
- Model Conversions 135
- 137
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