HP ProLiant DL380G5-WSS 3.7.0 HP StorageWorks HP Scalable NAS File Serving Sof - Page 345

20 Advanced monitor topics The topics described here provide technical details about HP Scalable NAS monitor operations. This information is not required to use HP Scalable NAS in typical configurations; however, it may be useful if you want to design custom scripts and monitors, to integrate HP Scalable NAS with custom applications, or to diagnose complex configuration problems. Custom scripts When you create a custom service or device monitor, you will need to supply a probe script that can determine whether the service or device is up or down. You can also supply Recovery, Start, and Stop scripts for any service or device monitor. Start and Stop scripts are run during monitor virtual host transitions. The Recovery script is run only when a probe script fails. Requirements for custom scripts The following requirements apply to all custom scripts created for use with service and device monitors. • The specification of the command and its parameters must be less than 512 bytes in total length. • The script must be an executable file in the filesystem. You can use shell scripts, Java scripts, C programs, or other types of executable files. • The command will be executed as root. • For a service monitor, the file must be installed on each server associated with the virtual host on which the service monitor is located. • For a device monitor, the file must be installed on each server that is configured with the virtual hosts associated with the device monitor. • The command termination exit status is used to signal script success or failure. A 0 (zero) exit status indicates script success; any other exit status indicates script failure. HP Scalable NAS File Serving Software administration guide 345