USAGE INSTRUCTIONS FOR VIRTUAL DISKS - DV

1. RUN DVSET - Changes an unused PUD to DV. Not needed if you SYSGEN
with a DV PUD. If you use DVSET, be sure to change the code to
reflect the correct PUD address of the unused PUD you wish to
change.
2. INS/TAS:VRTACP [11,1]BIGFCP - Installs an ACP for the virtual
disk. The system does some funny things if you try to use the
same ACP for both the virtual and real disk.
3. INS DV - Installs the handler
4. RUN/N DV.... - Loads the handler, which will respond with the
prompt

Virtual Disk File ?

Enter the virtual disk filename followed by any switches
(described below). All switches are optional, except for /CR,
which is required when creating the virtual disk file. The
default filespec is [1,1]VIRTUAL.DSK. Some switches you may want
to use are:

1. /CR - Create the virtual disk file.
2. /EM:XXXX - Emulate the disk type XXXX, e.g., RK07. This
switch is needed only if you plan to use DSC on your virtual
disk. The default for this switch is "Unknown".
3. /SI:n - Specifies the size of the virtual disk in decimal
blocks. The default at disk creation is 20000.
4. /LI - Lists the characteristics of the virtual disk (EM and SI
parameters).

5. Enter a Control-C to get PDS back.
6. ALLOC DV0:
7. INI/PRO:(WO:RWED)/FILE:(WO:RWED) DV0: Volumeid
8. DEALLOC DV0:
9. MOU/PROCESSOR:VRTACP DV0: Volumeid

The virtual disk is now mounted and ready for use. You can create new
UIC's, copy and delete files or anything else you do with real disks.

When finished dismount the virtual disk and unload the handler with:

DISM DV0: Volumeid
MCR UNL DV

You can now dismount the real disk (if other than the system disk).

WARNING: The dismount and unload operations MUST be done in the order
indicated. The virtual disk handler (DV) maintains an open file on the
real disk and MUST be unloaded (to close the file) before you can dismount
the real disk (and logout). This applies only to the terminal from which
the handler is loaded. Once the handler is loaded and the virtual disk
defined, other terminals can mount and dismount the virtual disk at will,
without mounting the real disk.