Mount points in a cluster domain

Mount points

On UNIX, Linux®, and AIX® operating systems, to mount a file system means to make that file system available to the operating system. During the mount operation, the operating system performs tasks such as reading index or navigation data structures, and associates a directory path with that mounted file system. That associated directory path that you can use to access the mounted file system is called a mount point.

Non-critical mount points or paths

There might be mount points or paths in your cluster that do not need to be failed over in the event of a failure. You can use db2haicu to add a list of those non-critical mount points or paths to your cluster domain. Your cluster manager will not include the mount points or paths in that non-critical list in failover operations.

For example, consider the case where you have a hard drive mounted at /mnt/driveA on a computer called node1 in your cluster. If you decide that it is critical for /mnt/driveA to be available, your cluster manager will fail over to keep /mnt/driveA available if node1 fails. However, if you decide that it is acceptable for /mnt/driveA to be unavailable if node1 fails, then you can indicate to your cluster manager that /mnt/driveA is not critical for failover by adding /mnt/driveA to the list of non-critical paths. If /mnt/driveA is identified as non-critical for failover, then that drive might be unavailable if node1 fails.