vxesd - Dynamic Multi-Pathing (DMP) event source daemon

/sbin/vxesd

The event source daemon (vxesd) registers with various sources of device-related events on the system. When vxesd receives notification of these events, it takes the appropriate actions. The vxesd also obtains information about the Fibre Channel and iSCSI SAN configuration for DMP.

The vxesd registers to the following event sources:

o	Device attach and detach events, provided by the operating system (OS)
	On Solaris, vxesd registers with the Reconfiguration Coordination Manager (RCM) and the sysevent framework to integrate seamlessly with the Dynamic Reconfiguration (DR) cfgadm utility so that vxesd receives notifications before a device is removed from the system and when a new device is attached to the system.
	When vxesd receives a notification that a device is being removed, vxesd checks whether the device is in use by Veritas Volume Manager (VxVM) or DMP. If the device is in use, vxesd notifies RCM about it to prevent removal of the device. If VxVM or DMP is not using the device, vxesd notifies DMP that the device is being removed from the system.
	When vxesd receives a notification about a new device arrival, vxesd triggers a VxVM device discovery with vxconfigd, so that the device becomes available for use by DMP and VxVM. Use the dmp_monitor_osevent tunable parameter to turn on or off the vxesd functionality to monitor OS events.
o	Fabric events from Fibre Channel SAN
	vxesd uses the SNIA HBA API library to obtain information about the Fibre Channel SAN and to register for event notifications from SAN that reach the HBA. On receiving a SAN disruption notification, vxesd notifies DMP about a likely failure in the affected part of the SAN.
	Use the dmp_monitor_fabric tunable parameter to turn on or off the vxesd functionality to monitor fabric events.
o	Events from the DMP driver.
	vxesd also registers for notifications from the DMP driver. On receiving these notifications, it logs these events with the exact time stamps in a circular log file. The log files are located at /var/adm/vx/dmpevents.log.*

By default, VxVM starts vxesd at boot time. To stop the vxesd daemon, use the vxddladm utility:

vxddladm stop eventsource

To start the vxesd daemon, use the vxddladm utility:

vxddladm start eventsource [logfile=logfilename]

The vxesd daemon is started with the current values of dmp_monitor_fabric and dmp_monitor_osevent tunables. When these tunables are changed, the vxesd daemon is restarted with the changed values.

/var/adm/vx/dmpevents.log

vxconfigd(1m), vxddladm(1m), vxdmpadm(1m), Storage Foundation Administrator’s Guide