VMS Help INITIALIZE, Qualifiers, /SHADOW *Conan The Librarian (sorry for the slow response - running on an old VAX) |
/SHADOW=(device_name_1, device_name_2, device_name_3) label Initializes multiple members of a future shadow set. Initializing multiple members in this way eliminates the requirement of a full copy when you later create a shadow set. The INITIALIZE command with the /SHADOW and /ERASE qualifiers performs the following operations: o Formats up to six devices with one command, so that any three can be subsequently mounted together as members of a new host- based shadow set o Writes a label on each volume o Deletes all information from the devices except for the system files containing identical file structure information. All former contents of the disks are lost. You can then mount up to three of the devices that you have initialized in this way as members of a new host-based shadow set. Compaq strongly recommends that you use the /ERASE qualifier. By using the /ERASE qualifier, no merge operation is required when you create the shadow set with the MOUNT command. All the devices must have identical, nonzero values for Total Blocks. You can view the Total Blocks value by entering the SHOW DEVICE/FULL command. If a device has never been mounted or initialized on this system, the SHOW DEVICE/FULL command for the device will not display a value for Total Blocks. To correct this condition, either mount and then dismount the device, or initialize the device. The Total Blocks value will then be displayed by SHOW DEVICE/FULL. Note that the INITIALIZE/SHADOW command should not be used to initialize a disk to be added to an existing shadow set, as no benefit is gained. Additional information can be found in Volume Shadowing for OpenVMS.
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