HP-UX HB v13.00 Ch-15 - Serviceguard

HP-UX Handbook – Rev 13.00 Page 12 (of 108)
Chapter 15 Serviceguard
October 29, 2013
The following figure portrays the result of a complete site failure:
Figure 4: Site failure
Node failures are detected by Serviceguard (by loss of heartbeat), and cause a cluster reformation
and package re-assignment to an adoptive node. Package failover stops the business solution for
the period of time that it takes to detect node failure + reform the cluster + move the package to
the adoptive node + fsck the data file systems + start the application on the failover node.
Though not fault tolerant in all aspects, Serviceguard clusters are a cheaper solution than full
fault tolerance systems such as the HP NonStop product line.
Node2
node1
SAN
Switch
1
Storage Array 1
SAN
Switch
2
USERS
Network
switch
1
Network
switch
2
pkgA
pkgB
pkgA IP
pkgB IP
pkgA
data
pkgB
data
Redundant
connections
Redundant connections
pkgA
data
pkgB
mirror
Storage Array 2
pkgA
mirror
pkgB
data
Boot &
AppA
AppB
Boot &
AppA
AppB
UPS POWER
UPS POWER