2–Getting Started
Best Practices
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To maximize performance, zone each MPX200 Fibre Channel port with one
or two ports from one of the array controllers.
To optimize performance, QLogic recommends that LUNs under migration
are balanced across two controllers of a storage array.
Choosing the Right 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 administrator.
To get optimum MPX200 performance, schedule a maximum of eight jobs to
run simultaneously.
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 intervention is required. Serial
scheduling helps ensure optimum bandwidth usage without filling up array
I/O queues, which may occur if jobs run simultaneously.
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
MPX200 uses limited array bandwidth for the data migration and does not
impact application performance during data migration.
General Precautions
Note the following general precautions:
Make sure 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 touched by any host other than the
MPX200 until the migration is complete.
In high availability (HA) configurations where the LUNs are visible from both
MPX200 ports, make sure that both ports from each MPX200 blade are
configured under a single host or host group entity in the array management
software. This configuration ensures that all MPX200 ports from the same
virtual port group (VP group) see the same set of LUNs as having the same
LUN ID. Failing to follow this configuration can lead to unpredictable or
erroneous behavior.
For a dual blade configuration for the MPX200, add the same VP group
WWPNs from both blades as one host entry. If you need to migrate more
than 255 LUNs, you may create additional host entries in the array using
WWPNs from additional VP groups in the MPX200.
