When using a shared disk unit, you need to install and set up the software product.
Installation and Setup of Related Software
Install and set up the software products (ETERNUS Multipath driver) required for using shared disk units. For details on the installation and setup procedure, see the "Software Information" for ETERNUS Multipath Driver.
Note
For immediate cluster failover if an I/O device where the system volume is allocated fails
In the default setting of the ext3 or ext4 file system, even if an I/O device where the system volume is allocated fails, a cluster failover does not occur and the system operation may continue based on the data stored on the memory.
If you want PRIMECLUSTER to trigger a cluster failover immediately when an I/O device where the system volume is allocated fails, perform the following setting.
Specify "errors=panic" to the mount option of each partition (the ext3 or the ext4 file system) included in the system volume.
Example: To set it in /etc/fstab (when /, /var, and /home exist in one system volume)
LABEL=/ / ext3 errors=panic 1 1 LABEL=/boot /boot ext3 errors=panic 1 2 LABEL=/var /var ext3 errors=panic 1 3 LABEL=/home /home ext3 errors=panic 1 4
However, an immediate cluster failover may not become available due to taking time for an I/O error to reach the file system. The regularly writing to the system volume enhances the detection frequency of I/O error.
