Specifying XRC utility volumes

XRC utility volumes are specified according to the configuration of the storage subsystem. See Table 1 when specifying XRC utility volumes. For more information, see Using XRC utility devices.

Table 1. Decision process for utility volume specification
If . . . Then . . . Notes . . .
Operating with non-IBM ESS storage subsystems: Specify at least one (ideally more than one) low-activity volume for each application (primary) storage control session as a utility volume (or volumes) for the system data mover.
  • If multiple volumes exist in the storage control session, they need not be dedicated, as the SDM switches to the least-busy volume at different times. SDM performance improves when you specify several candidate volumes that have little or no activity. This, in turn, improves the application I/O performance to volumes in XRC sessions.
  • See Using XRC utility devices for more information.
Operating with the ESS storage subsystem: You have the option to define a single-cylinder volume for specific use as a utility volume. See Using XRC utility devices for more information.
Parent topic: Setting up the extended remote copy environment