RAID and SAN configurations

Performance of a job (for IBM WebSphere® DataStage®, IBM WebSphere QualityStage™, and IBM WebSphere Information Analyzer) depends on all components being optimized. For RAID (Redundant Array of Independent Disks) and SAN (system area network) configurations, maximum performance is a combination of maximum bandwidth (controllers and disk) and minimized contention.
The following guidelines can assist in the configuration of RAID or SAN technologies:
  • Ensure that your database is optimally tuned.
  • Ensure that computers where you install the metadata repository tier and the services tier are on a high-speed network.
  • Minimize contention between temporary (scratch, buffer, and sort) and data file systems. For temporary storage, do not use a network file system (NFS). Consider using the local disk for temporary storage.
  • Minimize contention between the disks and controllers that are associated with IBM Information Server file systems and other applications or servers.
  • Consider isolating multiple mount points to separate high-speed disk interconnects and controllers.
  • Consider the trade-off between the granularity of file systems and the underlying configuration in comparison to the available, unused storage.
  • Do not create overly complex device configurations. These configurations can be difficult to administer and might not offer noticeable performance improvement.
  • If possible, check your configuration with expertise from hardware, storage, operating system, and application (IBM Information Server) personnel.
  • Remember that previous experience in designing I/O systems for nonparallel engines might lead to non-optimal configurations for IBM Information Server.
The optimal disk configuration balances cost, complexity, ease of administration, and ultimate performance.

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