The advantages of remote copy technologies are:
Other than z/OS Global Mirror, they are operating system independent.
Minimal host application outages.
The disadvantages of remote copy technologies include:
Same storage device types are required. For example, in a Metro Mirror configuration you need ESS 800 mirroring to a DS6000 (or an IBM approved configuration), but cannot have
Physical volume ID (PVID) and device name are not maintained, if not under LVM.
8.5.5Migration appliances
The following IBM migration appliances are available:
IBM Piper Services Offering
IBM SAN Volume Controller. This offering cannot be decommissioned after the data migration is completed at this stage. Therefore, the user should be aware of the implication of opting for this offering.
These data migration appliances provide smooth,
Facilitated by custom migration tools
Minimal customer involvement by IT staff, except planning
Minimal disruption or outages to IT operations
Tunable migration rate to eliminate impact to applications
Transparent to application servers
High throughput tool minimizes migration duration
Delivered by team experienced with many migrations
Maintains data integrity during migration
May fall back to the original data and storage device
Large number of operating systems and storage devices supported
The disadvantages of migration appliances are:
Cost of migration appliance or service
Application disruption to install and remove the appliance
See Appendix C, “Service and support offerings” on page 363 for storage services offerings.
8.5.6 z/OS data migration methods
Figure 8-14 on page 148 lists a number of data migration methods available to migrate data from existing disk systems to the DS6000 in a zSeries environment.
Chapter 8. Configuration planning | 147 |
