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Configuration: Premium Feature— Remote Replication 201
Reversing Roles Between the Primary and Secondary Virtual Disks
Reversing the roles between the virtual disks promotes the secondary virtual
disk to the role of primary virtual disk and demotes the primary virtual disk to
the role of secondary virtual. If the primary virtual disk in a remote virtual
disk replication fails, you can reverse the roles of the primary virtual disk and
the secondary virtual disk to transfer the data back to the restored virtual disk.
CAUTION: A potential loss of data access can occur if you reverse roles between
the secondary virtual disk and the primary virtual disk while a virtual disk copy is
in progress. The role reversal may succeed, but the virtual disk copy fails and
cannot be restarted.
• You cannot perform a virtual disk copy on a secondary virtual disk in a
virtual disk remote replication. To create a virtual disk copy of a secondary
virtual disk, you must reverse the roles of the secondary virtual disk and the
primary virtual disk, then perform the virtual disk copy on the new primary
virtual disk.
• While a virtual disk remote replication is synchronizing, you cannot
perform a virtual disk copy on either the primary or secondary virtual disk.
• If you reverse roles between a secondary virtual disk with less capacity than
the primary virtual disk, the role reversal succeeds but the usable capacity
of the new primary virtual disk equals the total capacity of the secondary
virtual disk.
book.book Page 201 Wednesday, June 8, 2011 5:01 PM