class
Directory Program
is a one-character spooling class. A through Z and 0 through q are valid. The class governs the printing of the real
spooled output. If the class operand is omitted, the default
is class T and is for console spooling.
For more information about defining consoles, including a tutorial
discussion, see VM/370 Operating Systems in Virtual The MDISK control statement describes the cylinder extent on a direct
access device to be owned by the user. The DASD area assigned with this
statement becomes the user's minidisk. Neither CP nor the directory checks that minidisks defined with
the MDISK statement do not overlap each other and (for 3330, 3340, and 3350 disks) that they do not overlap the "alternate track" cylinders at
the end of the real disk. If overlap occurs, file damage is inevitable.
The format of the MDISK control statement is:
r--------------------------------- , Kdisk cuu devtype {CYlr cy Is volser [mode [pr [pw [pm J J J J} , __ T-DISK cyls . I cuu
devtype {
CYlr } T-DISK is the virtual device address of 1 to 3 hexadecimal digits. is the device type: 2305 2311 Top
2311 Bottom
2314
2319 3330 3340 3350 (Top half of a 2314 or 2319)
(Bottom half of a 2314 or 2319)
For a 3350 device in native mode, specify 3350 as the device
type. For a 3350 used in 3330 compatibility mode, specify 3330. Specify a 3344 disk as a 3340, and a 3333 as a 3330. For a 3330V system volume, specify 3330 as the device type.
is a three-digit decimal cylinder relocation factor that
specifies the cylinder on a real disk which corresponds to
cylinder 0 of the virtual disk. If T-DISK (temporary disk) is
specified, temporary disk space is obtained at logon time from
preallocated system disk space. This space must be initialized
or formatted by the user when he logs on and is a part of his
virtual configuration until he logs off or detaches the disk,
at time the data area is returned for reallocation for
another T-DISK area. To maintain security this area should be
physically erased before it is returned.
Part 2. Defining Your VK/370 System 207

Directory Program
cyls
volser
mode It is not advisable to define that a minidisk start at
real cylinder zero (unless the minidisk is to be used by OS ISA", in which case it must begin at real cylinder zero). If
you do assign a minidisk beginning at real cylinder zero, the
user who owns it must realize that the minidisk label is the
real label that both he and the V"/370 system use to identify
the disk. Also note that CP-owned volumes must not have
minidisks beginning at real cylinder zero.
is a 1-to 3-digit decimal number specifying the number of
cylinders. l1axi!!!'y,! lcylinder&
Disk DOS and VSAM CMS C"S_ 2314 200 203 200 2319 200 203 200 3330-1 or 2 404 246 404 3330-11 808 246 808 3340-35 346 348 348 3340-70 696 682 696
*3344 696 682 696 3350 555 115 555 The number of cylinders indicated for the 3344 is for
each of the four logical 3340-70 devices.
If the device is a 2314 or 2319 and it is to be formatted by
IBCDASDI, then the minimum minidisk size is two cylinders
because, for these devices, IBCDASDI reserves a cylinder at
the end of every minidisk for alternate tracks. For other
devices, the minimum size is one cylinder.
is the volume serial number of the DASD volume (1 to 6
alphameric characters).
is the primary access mode requested for the device
(read-only, write, or multiple-write), and the alternate
access (read-only or write) desired (if any). An optional 'V' character, when appended to the mode request, specifies
virtual RESERVE/RELEASE processing.
R specifies that read-only (RIO) access is requested. The
access is not given if any other user has the disk in
write status.
RR W specifies that read-only access is requested,
another user has the disk in write status.
specifies that write access is requested. The
not defined if any other user has the disk in
write status.
even if
disk is
read or WR specifies that write access is requested if no other
user has the disk in read or write status, but that an
alternate access of read-only is acceptable if others do
have a link to the disk. " specifies that multiple access is requested. This means
that a write link is to be given to the disk unless
another user already has write access to it, in which
case no link is to be given. 208 IB" V"/370 Planning and System Generation Guide