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HP OpenVMS Systemsask the wizard |
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The Question is: Please can you tell me if there is any difference in a image backup done in standalone mode (Stabackit produced) and a image backup done with a "min" boot using the "/ign=inter" parameter ? Thanks The Answer is : BACKUP /IGNORE=INTERLOCK is equivalent to the (entirely hypothetical) BACKUP qualifier /ALLOW=DATA_INCONSISTENCIES. The use of BACKUP /IGNORE=INTERLOCK should be interpreted to indicate that data inconsistencies are expressly permitted by the caller -- the interlocks being overridden are implemented for a reason, and ignoring them indicates an acceptance on the part of the caller of potential corruption problems. Experienced OpenVMS system managers can usually restore on-line BACKUP/IMAGE savesets, though it is likely that some file data inconsistencies can arise among the open files, and also also possible that some information and configuration data will need to be manually recreated. Particularly experienced system managers -- those familiar with the OpenVMS system disk structure -- can also often restore a BACKUP non-/IMAGE saveset to disk, though this restoration cannot be performed solely using the OpenVMS VAX standalone BACKUP environment and -- like the use of /IGNORE=INTERLOCK savesets -- can involve some inconsistencies and loss of data among open files. (The steps involved either of these two restorations are generally site-specific, can and often do vary by the particular inconsistencies encountered, and are not particularly documented.) For an entirely consistent BACKUP (and one that can be restored without particular knowlege of the OpenVMS system disk structure and without having to recreate certain parts of the local system configuration), the OpenVMS Wizard recommends that the target disk be quiescent -- all applications shut down. In the case of an OpenVMS system disk, acheiving quiescense is possible only through the use of standalone BACKUP (OpenVMS VAX) or the bootable CD-ROM environment (OpenVMS Alpha) or OpenVMS running on another disk (with OpenVMS on the source disk shut down). Information on BACKUP /IGNORE=INTERLOCK as well as information on performing a system disk BACKUP is included in the OpenVMS documentation set, available via http://www.openvms.digital.com:8000/
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