Like VSAM RLS, DFSMStvs does not support the following options and capabilities:

• Linear data sets
• Control interval access (CNV) for any data set organization.
• Addressed access to a KSDS (relative byte address or relative record address)
• Access to key-range data sets
• Access to clusters with the IMBED attribute
• Access to temporary data sets
• Access using the ISAM compatibility interface
• Opening the individual components of a cluster
• Direct open of an alternate index
• GETIX and PUTIX macros
• Checkpoint/restart facility
• Catalogs accessed in RLS or DFSMStvs mode
• VSAM volume data sets (VVDS) accessed in RLS or DFSMStvs mode
• The ACBSDS specification
• Implicit positioning when a data set is opened (explicit POINT or GET NSP request required)
• Hiperbatch
• ADR MACRF option for a KSDS
• CFX MACRF option (ignored; NFX assumed)
• DDN or DSN MACRF options (ignored)
• DFR MACRF option (ignored; NDF assumed for direct requests that do not specify NSP)
• Improved control-interval processing (ICIP)
• Control blocks in common (CBIC)
• User buffering (UBF)
• SHRPOOL parameter of the BLDVRP macro (ignored)