Operating the system switchover facility

You can operate the system switchover facility in either monitor mode or server mode. In monitor mode, only system failures are monitored. In server mode, both system failures and server failures are monitored. In addition, system switchover might take less time in server mode than in monitor mode. The following table shows the failures that are monitored in monitor mode and in server mode.

Table 8-3 Failures monitored in monitor mode and in server mode

System switchover facility operation method	Monitored failure
System switchover facility operation method	System failure^#1	Server Failure^#2
Monitor mode	Y	N
Server mode	Y	Y

Legend:: Y: Monitored.; N: Not monitored.

#1

In this table, the following failures are assumed to be system failures; however, system failure conditions differ depending on the cluster software used. We recommend that you check your cluster software documentation for verification.

Hardware failure
OS failure
Power outage
Cluster software failure
System slowdown

#2

In this table, the following failures are assumed to be server failures; however, server failure conditions differ depending on the cluster software used. We recommend that you check your cluster software documentation for verification.

Abnormal termination of HiRDB (or unit if a HiRDB parallel server configuration)
Slowdown of HiRDB (or unit if a HiRDB parallel server configuration)
Database path errors

Organization of this subsection: (1) Cluster software that can be operated in monitor mode and in server mode; (2) Products needed to operate in server mode

(1) Cluster software that can be operated in monitor mode and in server mode

In this manual, the product that executes system switchover is referred to as cluster software. The following table lists the cluster software supported by HiRDB, and whether each product can be operated in monitor mode and server mode.

Table 8-4 Cluster software that can be operated in monitor mode and in server mode

Cluster software	Monitor mode	Server mode
HA Monitor	Y	Y
MC/ServiceGuard	Y	Y
VERITAS Cluster Server	Y	Y
Sun Cluster	Y	N
HACMP	Y	N
PowerHA	Y	N
ClusterPerfect	Y	N
LifeKeeper	Y	N
Microsoft Cluster Server (MSCS) Microsoft Failover Cluster (MSFC)	Y	Y

Legend:: Y: Can be operated in this mode.; N: Cannot be operated in this mode.

(2) Products needed to operate in server mode

The following table lists the products you need to operate the system switchover facility in server mode.

Table 8-5 Products needed to operate in server mode

Function	HiRDB Advanced High Availability	Hitachi HA Toolkit Extension
Normal system switchover	--	Y^#
User server hot standby	--	Y^#
Rapid system switchover facility	--	Y^#
Standby-less system switchover (1:1) facility	Y	Y^#
Standby-less system switchover (effects distributed) facility	Y	Y^#

Legend:: Y: The indicated product is needed to use the facility.; --: The product is not required.

#: You do not need Hitachi HA Toolkit Extension if HA Monitor is used as the cluster software (UNIX edition only).

8.1.2 Operating the system switchover facility

(1) Cluster software that can be operated in monitor mode and in server mode

(2) Products needed to operate in server mode