Download IBM XIV Storage System Business Continuity

Environments with replication
This section examines several scenarios of migrating Generation 2 to Gen3, using
server-based migrations in those environments where replication is already in place.
Source Generation 2 replacement only (Option 1:DR outage)
In this scenario, the source/primary site Generation 2 is being replaced with a new Gen3
while the remote/DR site Generation 2 remains and is not being replaced. The data at the
source site is migrated to the new Gen3 using server-based migrations. Replication continues
between the source and DR Generation 2. Using the methodology, data written by the server
are written to both the Generation 2 and Gen3 using LVM mirroring/ASM/SVM. Because the
source Generation 2 is still replicating to the DR Generation 2, the data is replicated to the DR
site. See Figure 10-40.
 Process
Gen2
 Allocate Gen3 LUNs to Server
 Sync Gen2 and Gen3 LUNs using LVM / ASM / SMV
 Writes will continue to be written to DR site
via Gen2
Gen3
Primary
Site
 Pros
Gen2
 No Server Outage (OS / LVM Dependent)
 LUN consolidation
 Migrates Data while maintaining DR during
migration of source site.
 Cons
 Uses Server Resources (CPU, Memory/Cache)
 DR Outage at End of Migration
Sync
Async
DR
Site
Figure 10-40 Replace source Generation 2 only; Phase 1
Chapter 10. Data migration
337