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HP Tru64 UNIX and TruCluster Server Version 5.1B-4: Patch Summary and Release Notes > Chapter 1 Enhancements, Improvements, and Features
New Attribute Controls Tape Driver Path Control |
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A new cam tape subsystem attribute, enable_preferred_path, lets you control preferred path behavior for a tape driver. Enabling this attribute (1) causes the tape driver to assign different paths to different tape drives. The default (0) disables preferred path behavior. The revised sys_attrs_cam(5) reference page delivered in this kit describes the enable_preferred_path attribute. A problem may exist when using preferred path behavior when you use a no-rewind tape device. If the application is not expecting the tape to change position between a previous tape close and a subsequent tape open, the data already on the tape may be lost with the next write command, possibly resulting in unusable backups. This problem only occurs when a system has multiple initiators. The following steps will prevent this problem from occurring:
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