Data Migration; Data Migration Application; Data Migration Operation; Migrating Vdisks Between Mdisk Groups - Cisco MDS 9216 Configuration Manual

Data Migration

Data Migration
The Data Migration feature allows you to change the mapping of VDisk extents to MDisk extents
without interrupting a host's access to that VDisk.

Data Migration Application

You can perform data migration on any VDisk managed by the SVC for the following purposes:
•
•
•
•
•

Data Migration Operation

After a data migration, the virtualisation policy of the VDisk is set to striped. When you request an
operation which requires some migration activity, SVC checks that sufficient suitable free extents exist
to complete the requested migration operation. If this is not the case then the migration will not be started
and the configuration command fails. However, once the operation starts, SVC does not reserve free
extents for the future use of the migration activity. This means that another migration activity can be
started to contend for free extents with existing migrations. If this happens, and no suitable free extent
is available to proceed with the migration, then the migration operation fails. The implications of this
are that migration between MDisk groups will normally be suspended and all other types of migration
is normally stopped.

Migrating VDisks between MDisk groups

To migrate VDisks from one managed MDisk group to another MDisk group, follow these steps.
Step 1 Create a cluster and the required VDisks (see
Display the configured VDisks in the newly-created cluster (called SampleCluster).
Step 2
switch(svc)# show cluster SampleCluster vdisk
-------------------------------------------------------------------------------
Name
-------------------------------------------------------------------------------
fn-data
fn-log
switch(svc)#
Create the new MDisk group to migrate the VDisks (see
Step 3
Display the configured MDisk group (called finance2).
Step 4
switch(svc)# show cluster SampleCluster mdisk-grp finance2
mdisk-grp finance2 is online
Cisco MDS 9000 Family SAN Volume Controller Configuration Guide
7-2
Redistributing workload within a Cluster across back-end storage.
Moving workload onto newly installed storage.
Moving workload off old/failing storage
Moving workload to rebalance a changed workload
Migrating in data from legacy back-end storage to SVC managed storage
Capacity
1.00 GB
1.00 GB
Total capacity is 17.08 GB
Free capacity is 17.08 GB
Extent size is 16 MB
Chapter 3, "Creating and Managing
iogroup mdisk-grp name
1 finance1
1 finance1
Chapter 4, "Managing Back-End
Chapter 7 Configuring Copy Services
Clusters").
Policy Status
striped online
striped online
78-16119-01, Cisco MDS SAN-OS Release 1.3
Storage").