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.