HP-UX 11i Tuning and Performance

9.11. Tuning Disk Bottlenecks

The three ways of tuning disk bottlenecks include hardware solutions, configuration solutions, and application solutions.

9.11.1. Hardware Solutions

There are a variety of hardware solutions, all of which can be thought of as “spending money” solutions. Here are a few common approaches:

• Add disks drives and rebalance the I/O load.

• Add disk adapters and rebalance the I/O load.

• Use faster disks.

• Use faster disk links (e.g., Fibre Channel versus F/W SCSI).

• Use more device controllers, if applicable.

• Switch from disk arrays to stand-alone disks or from stand-alone disks to disk arrays.

• Use mirroring (stand-alone or arrays) to improve read performance. This may, of course, hurt write performance due to the extra writes involved ...