IBM System/370 145 Manual page 222

using the same utility. Changes to space allocation, etc., can be made
via job control statements.
Direct organization (BDAM) data sets can be copied on a track-to-
track basis from the source direct access device to the 3330-series
drive, using IEHMOVE, or copied to tape and then to the 3330-series
drive. If more records are to be placed on a 3330-series track than are
on a source device track, the existing reorganization program can be
used to transfer the data to the 3330-series drive, and the program may
have to be changed. Reprogramming of the randomizing routine used in
the reorganization, and in all processing programs that access the BDAM
data set, is necessary if a relative track or actual address reference
is used and fewer (or more) 3330-series tracks are allocated to the data
set than before.
Subject to the restrictions stated in Section 10:05 and those
indicated for BDAM data sets, existing executable processing programs
can be used without change to process data sets that have been
transferred to 3336 packs. Nothing need be done to job control for
these programs if the cataloged procedures supplied with the language
translators are used, as long as the 3330-series is specified as a SYSDA
device at system generation. otherwise, job control statements must be
changed to request 3330-series devices and, optionally, any change to a
data set characteristic, such. as block size. RPS support, as described
previously, is provi.ded automatically.
User-written programs that use the EXCP level to access disk data
sets that have been transferred to 3336 packs may have to be modified to
reflect the characteristics of the data set on the 3336, a different
number of records per track, a different number of tracks per cylinder,
etc. A1l 2311 and 2314 CCW lists will operate on 3330-series drives
except those that are device or channel time dependent and those that
support the file scan feature, which is not available for the 3330-
series. User-written 2311 or 2314 error routines will not execute
correctly and must be modified. RPS commands have to be added by the
user if this support is desir~d for programs that use EXCP. (Note that
the XDAP macro includes support of RPS commands.)
Data sets currently located on 2303 Drum Storage can be placed on a
2305 facility, using a data set utility program. Unit specification in
the job control statements of existing programs that will access the
2305 facility, instead of the 2303 drum, must be changed. Also, to
reflect the larger capacity of a 2305 track, i t may .be necessary to
alter the block size used. The latter also can be done via job control
statement alterations (without. program reassembly) unless block size was
specified in the program itself.
CONVERSION TO THE 3410/3411 AND 3803/3420 MAGNETIC TAPE SUBSYSTEMS
As previously stated, existing tape processing programs and their
tape volumes need not be modified in order to be used with 3410/3411 and
3803/3420 SUbsystems with equivalent features whenever the same
recording modes are used. Existing 2400-series support is used to
support the 3803/3420 subsystem. Therefore, existing job control
statements for 2400-series tape unit jobs need not be modified to
specify a 3420. However, job control statements that indicate a 2400-
series tape unit must
be
modified to specify the 3410 when a 3410
replaces a 2400-series unit.
Whenever possible, seven- and nine-track NRZI mode tape volumes
should be
converted to 1600-BPI PE format to obtain the benefits of the
higher density and the PE recording technique. In cases in which tape
volumes must retain seven-track NRZI format, for interchange with other
212 A Guide to the IBM System/370 Model 145