HP serviceguard t2808-90006 manual Understanding Types of Disaster Tolerant Clusters

Disaster Tolerance and Recovery in a Serviceguard Cluster

Understanding Types of Disaster Tolerant Clusters

Table 1-1	Comparison of Disaster Tolerant Cluster Solutions (Continued)
Attributes	Extended Distance	CLX	Continentalclusters
	Cluster		(HP-UX only)
Application	Automatic (no manual	Automatic (no manual	Semi-automatic (user
Failover	intervention required).	intervention required).	must “push the
type			button” to initiate
			recovery).
Access Mode	Active/Standby	Active/Standby	Active/Standby
for a
package
Client	Client detects the lost	Client detects the lost	You must reconnect
Transparen	connection. You must	connection. You must	once the application is
cy	reconnect once the	reconnect once the	recovered at second
	application is recovered	application is recovered	site.
	at second site.	at second site.
Maximum	2 nodes for this release.	2 to 16 nodes	1 to 16 nodes in each
Cluster Size			cluster supporting up
Allowed			to 3 primary clusters
			and one recovery
			cluster. (maximum
			total of 4 clusters-64
			nodes)
Storage	Identical storage is not	Identical Storage is	Identical storage is
	required (replication is	required.	required if
	host-based with MD		storage-based
	mirroring).		mirroring is used.
			Identical storage is
			not required for other
			data replication
			implementations.

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