April 1, 1981
280.2IBM VM/370 System programmer's Guide
280.2
DEQ DEVTYPE POINT POST WAIT CMS supports the following disk formats for the os and OS/VS sequential and partitioned access methods: • Split cylinders • User labels • Track overflow • Alternate tracks
As inOS, the CMS support of the BSP macro produces a return code of
4 when attempting to backspace over a tape mark or when a beginning of
an extent is found on an as data set or aDOS file. If the data set or
file contains split cylinders, an attempt to backspace within an extent,
resulting in a cylinder switch, also produces a returncode of 4. Before CMS can read an as data set or DOS file that resides on a you must issue the CMS ACCESS command to make the disk on which it
resides available toCMS. The format of the ACCESS command .L;::). ACCESS cuu moder/ext] You must not specify options or file identification when accessing an OS or DOS disk,. You then issue the FILEDEF command to assign a CMS file identification
to theOS data set or DOS file so that CMS can read it. The format of
the FILEDEF command used for this purpose is:r r "
r
,
Flledefrd;:me} IDISK fn ft Ifmll IDSN ? I I IA111 IDSN q1 [q2 ••• ]1 L L .J.J L .J r r
"DISK Ifn ft Ifmll IAll1 L L .J.J DUMMY r , QE!!2ll: iMEMBER membernamel ICONCAT I L .J
Part 3. ConversationalMonitor System (eMS) 281
As in
4 when attempting to backspace over a tape mark or when a beginning of
an extent is found on an as data set or a
file contains split cylinders, an attempt to backspace within an extent,
resulting in a cylinder switch, also produces a return
resides available to
to the
the FILEDEF command used for this purpose is:
r
,
Flledef
"
Part 3. Conversational
