NEC PathManager

Chapter 3 Functions of NEC Storage PathManager

C:\>spscmd -getmscsmode

MSCS : Disable

C:\>spscmd -setmscsmode E

C:\>spscmd -getmscsmode

MSCS : Enable

C:\>

The -getmode option of the spscmd can also be used to check the settings for MSCS liaison.

C:\>spscmd -getmode

Class : Enterprise

Failback : Active

MSCS : Disable

C:\>

Note also that the settings for dynamic load balancing cannot be made if the program is working

with MSCS.

3.5 Path patrol

This function periodically monitors the state of all paths that are available or unavailable for use. NEC

Storage PathManager has a health check function and a recovery check functi on. In the health check function,

paths that are available for use are monitored, and the failover function is automatically activated in case of

failures. In the recovery check function, paths that are not used due to failures are monitored, and the

failback function is automatically activated at the time of failure recovery. The path patrol service and the

NEC Storage PathManager driver allow execution of these functions.

The path patrol service issues requests for path monitoring to the NEC Storage PathManager driver every

specified period of time. Once the NEC Storage PathManager driver receives requests, it checks the state of

specified paths. The NEC Storage PathManager driver issues monitoring I/O if the paths have not been used

for a certain period of time. When the I/O is successfully complete, the paths are regarded as being available

III-16