HP SNA Data Transfer Facility for OpenVMS

HP SNA Data Transfer SPD 27.85.13
Facility for OpenVMS, Version 3.6
DTF Access from the Mainframe
IBM DTF users can initiate nonrecoverable or recover-
able, bidirectional file transfers between OpenVMS DTF
clients running the OpenVMS/DTF utilities software and
themselves. In addition, they can initiate nonrecover-
able, bidirectional file transfer between all other DTF
clients (including other IBM systems) and themselves.
Mainframe TSO users have the following commands
available to transfer files to or from other DTF clients.
DTFSEND DTFRECV DTFRESUM
DTF command
processor
DTF ISPF
panels
DTF non-ISPF panels
Checkpoint and Recovery
Checkpoint and recovery capabilities ensure that data
remains accurate and intact, even in the event of sys-
tem or network failure. When OpenVMS users trans-
fer files using the TRANSFER/DTF utility, it automati-
cally resumes an interrupted file-transfer process with
no loss of data when communications between send-
ing and receiving systems is reestablished. Checkpoint
and recovery is supported for non-VSAM files that are
disk or tape resident. Checkpoint and recovery is not
supported on VSAM files.
IBM users have a similar checkpoint and recovery fea-
ture. A recoverable copy operation performed from an
IBM system sets environment variables (CLISTs). If
the transfer terminates with a network error, these vari-
ables contain information to allow the user to resume
the transfer.
File Backup
DTF for OpenVMS allows OpenVMS users to back up
and restore their disks directly to IBM tapes or disks
using the OpenVMS BACKUP command. Users have
the ability to include an allocation space qualifier when
backing up files to target IBM disks to ensure proper
disk space availability.
Remote Job Submission
OpenVMS users can submit JCL files on the IBM system
to be executed by JES or by a batch machine. These
users can use the standard file operation commands
to initiate the job submission. For example, OpenVMS
users use SUBMIT/REMOTE. Users will not get the sta-
tus of the job completion. IBM DTF users can submit
jobs by using the post-processing feature described in
the next section.
Post-Processing
Post-processing is the ability to submit a DCL command
procedure or mainframe JCL procedure after a file trans-
fer is completed. IBM users can use the post-processing
feature from either the command processor or the panel
interface. OpenVMS users can use the post-processing
feature only through the TRANSFER/DTF utility.
Record-Level Access
DTF for OpenVMS allows an OpenVMS user record-
level access to IBM files by means of an RMS applica-
tion or DCL commands. DTF does not support record-
level access initiated from IBM to OpenVMS RMS files.
Supported File Types
All OpenVMS file types are supported. ODS-5 Extended
File Specification is not supported.
For IBM mainframe systems, supported non-VSAM file
types are those with the physical sequential data set
organization. This includes normal sequential files as
well as partitioned data set members. Both disk-resident
and tape-resident non-VSAM files are supported. Sup-
ported VSAM file types include entry-sequenced data
sets (ESDS), relative-record data sets (RRDS), and key-
sequenced data sets (KSDS).
DTF for OpenVMS provides an option for users to over-
come the null record restriction by substituting a record
containing a character or value chosen by the user. A
mixed-case option supports applications on the IBM side
that create file specifications that are case sensitive.
The case qualifier supports file specifications that con-
tain lower case characters.
HSM Support
MDU supports the Hierarchical Storage Management
(HSM) facility and allows users to recall migrated data
sets. IBM system programmers can tailor the number of
concurrent outstanding HSM requests as well as device
recall capability.
SMS Support
MDU supports the mainframe Storage Management
Subsystem (SMS) facility.
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