Best Practices; High Availability And Redundant Configurations; Choosing The Correct Dms Options; General Precautions - HP StorageWorks MPX200 Solution Manual

NOTE:
HP recommends that you do not simultaneously run more than four data migration jobs.

Best practices

This sections provides some best practices recommendations for DMS usage.

High availability and redundant configurations

The following recommendations pertain to high availability (HA) and redundant configurations:
• The HP MPX200 router is capable of detecting and performing load balancing over multiple paths.
To achieve the highest data migration rates, zone multiple ports from each array controller with
each port of the HP MPX200 router.
• To maximize performance, zone each HP MPX200 router Fibre Channel port with one or two
ports from one of the array controllers.
• To optimize performance, HP recommends you balance LUNs under migration across two controllers
of a storage array.

Choosing the correct DMS options

Follow these guidelines when choosing DMS options:
• Use the Configure Only option to configure migration jobs while applications are still online. Then,
start the migration jobs as soon as the server offline notification is received from the system admin-
istrator.
• To get optimum HP MPX200 router performance, schedule a maximum of eight jobs to run simul-
taneously.
• To sequentially run migration jobs, use the serial scheduling feature, which allows the migration
jobs to start automatically after the jobs with previous priority values are completed; no user inter-
vention is required. Serial scheduling helps ensure optimum bandwidth usage without filling up
array I/O queues, which may occur if jobs run simultaneously. Serial scheduling works best when
migrating multiple jobs of similar size.
• Use the array bandwidth feature when applications are still using different LUNs of the array while
DMS is migrating the data. This ensures that the HP MPX200 router uses limited array bandwidth
for the data migration and does not impact application performance during data migration.

General precautions

Note the following general precautions:
• While performing offline data migration, ensure that hosts connected to source and destination
LUNs are either zoned out completely, or that LUN masking is changed appropriately such that
the LUNs being migrated are not accessible by any host other than the HP MPX200 router until
the migration is complete.
• During online data migration, the host I/Os are routed through the HP MPX200 paths. For HP-UX
hosts, ensure that the initiator type is set to HP-UX. In HP MPX200 Manager, in the left pane under
the Discovered FC Initiators node, select an initiator, and then in the Information window in the
right pane, click HPUX in the OS Type Selection box. In the CLI, issue the initiator mod com-
mand, select the initiator, and then select the OS Type of HP-UX.
150 Performance and best practices