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Software Mechanism to Detect Loss of Access to Storage Devices in an AIX Environment Disclosure Number: IPCOM000032158D
Original Publication Date: 2004-Oct-22
Included in the Prior Art Database: 2004-Oct-22

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There is an increasing emphasis on providing continuously available systems for storage subsystems. The AIX High Availability Cluster Multiprocessing (HACMP) application provides a foundation for developing high availability systems. However, some criteria for determining when a system should take over various resources still must be defined as appropriate for each environment that utilizes the AIX HACMP application. Detecting loss of access to file systems that are critical to an application is one example. A practical example of this would be a situation where the SAN controller for node a lost power but node b still has access through a different SAN controller. This publication describes a mechanism to detect loss of access to critical file systems and take action. This functionality is applicable not only to highly available systems, but to non high availability systems as well. Once loss of access to file systems is detected, the system can choose to take whatever action is desired