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|Data migration checklist|
There are many methods at different price points to move data. Some organizations may be able to simply use the move command that comes with every operating system. Others may need standalone utilities and network- and host-based approaches to get data from point A to point B. What's the best way to move data? To determine which method suits your needs, consider the following:
- Type of application and data
- Impact on application performance
- Storage infrastructure
- Network throughput
- CPU and memory consumption
- Affected users
While some applications allow outages, many times it's simply not practical to shut down an application to perform the migration. The utility you choose should be able to monitor the application, increase and decrease the speed of the data migration or even stop the data migration if the application becomes exceptionally busy. This will allow server resources such as CPU and memory to be diverted from the data migration utility to the application.
A specialized migration tool isn't necessarily more effective in moving data. Host-based software such as Veritas Software Corp.'s Volume Replicator is often used to avoid vendor lock-in. However, host-based software can be costly and difficult to manage, depending on the number of servers, operating systems and arrays involved.
Array-based utilities such as EMC's Symmetrix Remote Data Facility (SRDF) and IBM's Peer-to-Peer Remote Copy (PPRC) tie users to a specific vendor's hardware, but can be administrated by a smaller, well-trained staff with minimal intervention required at the server level during the migration process.
Click here for a data replication software table (PDF).
This was first published in May 2004