6.4 Specifying settings for using SCSI reservation for shared disk

This section explains the settings for using SCSI reservation for shared disk in HA Monitor.

In a VMware ESXi-based virtualization environment, a single path configuration is normally assumed because paths are switched by VMware ESXi even in a redundant configuration. The following figure shows an example of a VMware ESXi-based virtualization environment in which Fibre Channel connections are employed in a redundant configuration.

Figure 6‒6: Example of a redundant configuration in a VMware ESXi-based virtualization environment (using Fibre Channel)

If you configure the OS on a virtual machine to directly recognize the shared disk with iSCSI connection, you can also use VMware ESXi's optional functions, such as vMotion. In this case, set up VMware ESXi to recognize only the LANs, not the shared disk. In a redundant configuration, use the multipath software (DMMP) with the OS on the virtual machine. In this configuration, DMMP switches paths.

The following figure shows an example of a redundant configuration that uses DMMP in a VMware ESXi-based virtualization environment.

Figure 6‒7: Example of a redundant configuration in a VMware ESXi-based virtualization environment (using DMMP)

Organization of this section

• 6.4.1 Setting up multipath software

• 6.4.2 Determining the values to be specified in the operands required for SCSI reservation of the shared disk if LVM is used

• 6.4.3 Determining the values to be specified in the operands required for SCSI reservation of the shared disk if LVM is not used

• 6.4.4 Handling SCSI-related messages output to syslog

• 6.4.5 Specifying the udev rules

• 6.4.6 Notes about SCSI reservation for shared disk

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