Estimating the time to migrate

This topic describes how to estimate the amount of time it takes to migrate data.

Prerequisites

For large migrations, it is recommended that you estimate the amount of time that it will take to migrate the data set before you begin. The data-migration utility estimates this time based on several factors:
  • Data-transfer rate over the storage area network (SAN)
  • Amount of data being migrated
  • Amount of available disk space on the target file system
  • Amount of available memory
  • Number of CPUs

To determine the data-transfer rate, the data-migration utility copies a set of the actual files from the source to the target file system.

Note: The estimation process can take a while if the data set is comprised of a large number of small files.

Review the data-migration prerequisites before you use the data-migration utility.

Steps

  1. On the client machine, change to the directory where the migratedata command is located. For AIX, this is the /usr/tank/migration/bin directory. For Windows, this is the c:\Program Files\IBM\Storage Tank\Migration directory.
  2. Invoke the migratedata –phase plan command.

Parent topic: Migrating data

Related concepts
Data migration

Related reference
Data-migration considerations

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