Guidelines for maximizing host server I/O performance

Use the following guidelines to minimize the impact of pair operations on host server I/O performance:

• If you are creating SI pairs, try one or both of the following:

  • Create the pair when the I/O load is light.

    For more information about checking I/O performance-related information, see the Hitachi Device Manager - Storage Navigator User Guide.

  • Limit the number of pairs that you simultaneously create.

• If you are creating, splitting, or resynchronizing SI pairs, select a slower copy pace. You can enable the system option for copy pace or you can select a specific copy pace while performing the task.

  For more information:

  • About enabling the system option for copy pace, see Setting HOST I/O Performance options .
  • About selecting a copy pace while creating SI pairs, see Creating ShadowImage pairs.
  • About selecting a copy pace while splitting SI pairs, see Splitting ShadowImage pairs.
  • About selecting a copy pace while resynchronizing SI pairs, see Resynchronizing or restoring ShadowImage pairs.