Your customer has an existing HP StoreVirtual P4500 G2 multi-site SAN, which has become
I/O constrained. They want to implement a new higher performance tier into the existing
management group. Which Peer Motion method provides the ability to dynamically
rebalance data volumes to the higher performance tier?

A.
dynamic LUN management

B.
cluster swap

C.
Remote Copy

D.
volume migration

Explanation:
http://h20195.www2.hp.com/V2/GetPDF.aspx%2F4AA4-2922ENW.pdf
Peer Motion on HP StoreVirtual Storage: Volume migration
Peer Motion on HP StoreVirtual Storage allows a system administrator to move an HP
StoreVirtual volume from one cluster to another, online, without having to reconfigure the
host or applications. This is done by simply editing the properties of a volume, selecting the
Advanced tab, and choosing a new cluster from the cluster drop-down box. The blocks that
make up the volume on the original cluster will begin to migrate to the new cluster, and the
LeftHand OS will automatically redirect and proxy requests for blocks to the proper cluster as
the data migration is underway. When the migration is complete the iSCSI sessions to the
new cluster from the host are automatically restored (assuming the new cluster’s virtual IP
address has been added to the iSCSI configuration of the host server). A typical use case for
Peer Motion could be a volume that contains data for an application that has increasing
performance needs. If The volume started out on an MDL SAS cluster, a storage
administrator could use Peer Motion to move the volume to a SAS-based cluster. If the
volume is on a SAS cluster, the storage administrator could choose to add more nodes to
the cluster to provide more performance for the volume, or they could choose to move the
volume to an even higher performing tier, such as an SSD-based cluster.
Peer Motion on HP StoreVirtual Storage: Cluster swap The virtualization of storage within an
HP StoreVirtual cluster means that the rules about data being tied to physical hardware
resources no longer applies. This virtualization allows volumes to be moved dynamically
between different physical hardware clusters, and also allows for a feature called cluster
swap—the ability to remove existing storage nodes from a cluster and replace them with
new storage nodes, online, with no loss of data or data availability. In one operation, data
from the old storage nodes is moved to the new storage nodes, and all IO is properly
directed to the correct node. Upgrading to newer, faster, or larger storage nodes does not
require any downtime, providing a clear, well-defined strategy for future expansion and
growth. As an example, a customer might start out with a cluster of 8 drive systems. As the
customer adds more applications and workload to the cluster, they could reach the

Performance or capacity limit of the nodes. They could easily migrate to nodes with 12 or
more drives to increase capacity and performance, without having to bring any applications
offline.