HP StorageWorks Clustered File System 3.6.0 Windows Storage Server Edition Administration Guide (403103-005, January 2008)

Chapter 17: Configure Device Monitors 208
Activity Types for Device Monitors
The activity type specifies where the device monitor can be active. The
activity type can be one of the following:
• Single-Active. The monitor is active on only one of the selected
servers. Upon server failure, the monitor will fail over to an active
server unless all associated service and device monitors are down.
(“Associated” service and device monitors are those monitors that are
associated with the same virtual host as this device monitor.)
• Single-Always-Active. The monitor is active on only one of the
selected servers. Upon server failure, the monitor will fail over to an
active server even if all associated service and device monitors are
down. (“Associated” service and device monitors are those monitors
that are associated with the same virtual host as this device monitor.)
• Multi-Active. The monitor is active simultaneously on all servers
configured for the monitor.
By default, DISK, GATEWAY, and SHARED_FILESYSTEM monitors are multi-
active. This configuration allows the device monitor to probe a shared
resource such as a network gateway or a SAN partition containing a PSFS
filesystem.
NTSERVICE and CUSTOM monitors can be either single-active or multi-
active, depending on the service or device being monitored.
DISK Device Monitor
A
DISK device monitor can be used to watch a local drive on a server. It
periodically attempts to read the first block of the disk partition that you
specify. This monitor is multi-active by default and will probe on all
servers on which it is configured.
If you want to monitor a PSFS filesystem on a SAN device, use a
SHARED_FILESYSTEM monitor instead of a DISK monitor.
SHARED_FILESYSTEM
5 seconds 30 seconds Filesystem, filename
CUSTOM
60 seconds 60 seconds User probe script
Type
Default
Timeout
Default
Frequency Other Parameters