Enterprise storage server support
TDMF supports the IBM® Enterprise Storage Server® (ESS) Storage Controller with the Parallel Access Volume (PAV) feature.
Support for the PAV feature is in exploitation mode. This means that during the life of a TDMF migration the PAV feature is dynamically disabled and dynamically re-enabled when the migration completes for that volume only.
Before migrating data to, or establishing data on, an IBM Storage Controller (ESS) device, customers should ensure that they understand these I/O functions.
The ESS subsystem can be defined with Transparent
, Toleration
,
or Exploitation
mode.
- Transparent mode
- IODEVICE macro instruction with UNIT=3390
If the preceding is true, then the PAV feature is not enabled. TDMF functions with no issues.
- IODEVICE macro instruction with UNIT=3390
- Toleration mode
- CNTLUNIT macro instruction with UNIT=2105
- IODEVICE macro instruction with UNIT=3390B
If the preceding is true, TDMF migrates this volume as if it were in exploitation mode.
- IODEVICE macro instruction with UNIT=3390A
If the preceding is true, then the device is defined as an alias PAV volume. TDMF will not migrate these volumes.
- Exploitation mode
- CNTLUNIT macro instruction with UNIT=2105
- IODEVICE macro instruction with UNIT=3390B
If the preceding is true and the proper levels of MVS™ maintenance is installed, TDMF will migrate this volume as if it were in exploitation mode, and the device is eligible as a base PAV volume. TDMF supports both standard and dynamic PAVs.