EMC DASD

Using EMC DASD might require the installation of EMC Application Interfaces, obtained from EMC.

Application program interfaces
Using EMC DASD may require the installation of EMC Application Interfaces, obtained from EMC, if the source or target volumes use the Symmetrix Remote Data Facility (SRDF), with or without the EMC Consistency Group software installed or if any EMC SAR function is used.
EMC symmetrix control facility
Communications to EMC DASD is accomplished via the EMC Symmetrix Control Facility, and EMC subsystem names. To determine the need for additional SCF$xxxx DD statements, issue the MVS command display (D SSI MVS) to see the subsystem names. The normal default EMC subsystem name for the Symmetrix Control Facility (SCF) is EMC. The normal default EMC subsystem name for the EMC Remote Data Facility is EMC2.
Consistency groups
TDMF, in conjunction with the proper microcode and EMC Consistency Group software, provides support for the swap migration of source volumes that reside on EMC DASD devices utilizing the Symmetrix Remote Data Facility (SRDF), and optionally can exist as part of an EMC Consistency Group.
EMC configuration guidelines
When defining EMC devices as members of a Consistency Group, all systems in the shared DASD complex must activate the EMC CONGroup started task, and the parameters must agree.
Symmetrix manager
If the source or target volumes are controlled by the EMC Symmetrix Manager, those volumes must be removed from the Symmetrix Manager’s control, or the Symmetrix Manager must be shut down during a migration session. Failure to do so will cause TDMF to terminate the migrations with an error message (GTD2362) indicating an invalid operation code when the Symmetrix Manager issues either a Diagnostic Write (73) or Diagnostic Control (F3) operation code. Message GTD2596I will follow the error message indicating where the invalid operation code came from.
Migrating from SRDF to PPRC/HDS TrueCopy volumes
TDMF will allow the migration of a device involved in an SRDF session to a volume that is involved in a PPRC (synchronous) session, or a HDS volume active with either a synchronous or asynchronous TrueCopy session. In order to allow swaps from these SRDF volumes, the common option ALLOWmirrorchange must be specified.
SRDF session types allowed
TDMF supports sessions where a source or target volume might be involved in an SRDF session.
Coexistence with EMC’s z/OS migrator
EMC’s z/OS Migrator should not be used to migrate data to or from any volumes being used as source volumes in active TDMF migration sessions. TDMF cannot detect the presence of z/OS Migrator and cannot determine its intentions, any attempts to use z/OS Migrator and TDMF to migrate the same data could lead to unpredictable and unintended results.

Parent topic: Planning