Array Properties; Data Migration Jobs; Offline Data Migration - HP StorageWorks MPX200 Solution Manual

Array properties

DMS either discovers the Fibre Channel target ports zoned in with the HP MPX200 router Fibre
Channel ports, or it discovers and logs into iSCSI IQN targets using iSCSI login. It forms an array
when at least one data LUN is presented to the DMS running in the HP MPX200 router from that
array. If no data LUN is presented to the HP MPX200 router, all array ports are shown in the HP
StorageWorks mpx Manager GUI and CLI as target ports.
DMS classifies the discovered storage array controllers into two categories: targets and arrays. All
array controller ports are initially identified as targets by the HP MPX200 router. After a single data
LUN is detected on the target, DMS forms an entity called an array. A specific LUN seen through
multiple Fibre Channel target ports are grouped under a single array.
Configure the array entity created by the DMS for the following attributes:
• Symbolic name: Upon forming an array, the HP MPX200 Multifunction Router automatically assigns
a symbolic name to an array. HP highly recommends that the you assign a more meaningful name
to an array because the migration logs identify the source and destination LUNs with the symbolic
names of the source and destination arrays.
• Array type: DMS requires the classification of each array as either Source, Destination, or
Source+Destination. During the creation of migration jobs, the Data Migration wizard restricts the
assignment of a source LUN only from arrays that have an attribute Source and assignment of a
destination LUN only from the arrays with attribute Destination. Use the array attribute
Source+Destination only when you need to create copies of a LUN on the same array.
Select the array type attribute None to exclude the storage array from participating in data migra-
tion. The HP MPX200 router simultaneously supports both iSCSI connectivity and data migration
service. Typically, you would use the "None" attribute when the HP MPX200 router is used to
provide only iSCSI connectivity for that storage array.
• Array bandwidth: This feature is applied only to a source array. This value indicates the maximum
bandwidth available from the array for a data migration task. The bandwidth is computed over
all paths. The HP MPX200 router uses only the user-assigned array bandwidth to migrate the data.
This allows other applications and servers using the same source array to continue to perform at
an acceptable performance level.
• Load Balancing: The HP MPX200 router detects all available multiple active and passive paths to
the LUN. Load balancing distributes the load for migration jobs over multiple active paths, thus
improving the migration rate. Load balancing should be disabled only in case of trouble performing
data migration.

Data migration jobs

DMS manages the data migration processes in terms of data migration jobs. A maximum of 256 jobs
can be scheduled to run at any time.

Offline data migration

DMS as an offline service allows you to migrate data between any Fibre Channel storage arrays,
iSCSI storage arrays, or Fibre Channel and iSCSI storage arrays. Offline service assumes that when
a data migration job for the specified LUN starts, access to the LUN is blocked for servers and
applications Microsoft Exchange, Oracle Applications, and other applications that are using the
source LUNs for data storage. You do not need to bring down these applications during the initial
setup and configuration of DMS. DMS minimizes the downtime by allowing the complete setup and
configuration of data migration jobs (except for immediate scheduling of the jobs) without bringing
14 Introduction