@ LDDRIVER, SYSTEM_MGMT, OpenVMS VAX and Alpha Virtual Disk Driver  > The logical disk utility is a system management tool availableC to any user for controlling logical disk usage. It can also be used B for testing out things like volume shadowing, striping, host-basedI raid, or software which does dangerous things to disks without disturbing  a real disk.  F A Logical Disk is a file available on a Physical Disk, which acts as aE real Physical Disk. The Logical Disks can be created in any directory  of the Physical Disk.   G A large disk can be divided into smaller sections, each a Logical Disk, E supporting the same I/O functions as the Physical Disk. By giving the E Logical Disk File a good  protection level and mounting it private or B with device protection, you are able to add a number of protection levels to your file system.   E Logical disks may be just a single disk, part of a volumeset, part of F a stripeset, part of a host-based shadowset, part of a host-based raid set or any combination.   L The file to be used for the logical disk may be placed on any physical disk,; in any directory. A backup can be made to protect the disk.   J Another possibility is logging of all I/O requests for the driver, as well: as suspending/resuming I/O requests on certain conditions.  J A physical device may be 'replaced' by a logical disk to enable logging ofK all I/O of the physical disk. In that case we don't use any container file.   D This driver can be used to create for example ODS-2 Cdrom's on a PC.F Just create a containerfile, hook it to a logical disk drive, mount itE and copy anything you like. Then take the container file to a pc, and ( burn this file in raw format to a Cdrom.  I The driver is now supported for both the VAX and the Alpha architectures.   G The only limitation at present is that this tool needs at least OpenVMS D Version V5.4. Binaries are only supplied for version V6.2 and up forF OpenVMS VAX, and for V6.2 and up for OpenVMS Alpha. But since the fullB sources are included a straight rebuild should be enough to get itJ running on V5.4 and up. Be sure to read the releasenotes before an attempt  is made to rebuild from scratch.  H The driver can be installed with VMSINSTAL. The LD062.B saveset containsB the sources, the other kits the binaries for various VMS versions.7 After installation full help is available with HELP LD.   , For any questions please contact the author:           Jur van der Burg         Compaq B.V.          Europalaan 44          3526 KS Utrecht          The Netherlands ! 	Email: jur.vanderburg@compaq.com   