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ExpressCluster X 2.0 for Windows Reference Guide - Nec

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Chapter 7 Monitor resource details<br />

576<br />

The TUR monitor resource 1 detects an error in server2 as is the case in server1. However, no<br />

recovery action is taken because the failover group A, the recovery target, is activated.<br />

For more in<strong>for</strong>mation on recovery executed by monitor resources against their recovery targets,<br />

see “Behavior when an error is detected by a monitor resource” on page 557<br />

Activation<br />

failure<br />

Server1 Server2<br />

Monitor resource<br />

Disk TUR monitor<br />

resource 1<br />

Shared<br />

disk<br />

Server1 Server2<br />

Monitor resource<br />

Disk TUR monitor<br />

resource 1<br />

Failover Group A<br />

Disk resource 1<br />

Application resource 1<br />

Floating IP<br />

resource 1<br />

Monitor resource<br />

Disk TUR monitor<br />

resource 1<br />

Failover Group A<br />

Disk resource 1<br />

Application resource 1<br />

Floating IP<br />

resource 1<br />

Shared disk<br />

Monitor resource<br />

Disk TUR monitor<br />

resource 1<br />

Failover of the failover group<br />

A, due to the failure of<br />

activating the disk resource 1,<br />

starts in server2.<br />

“Failover threshold” of the<br />

group resource is failover<br />

count on a server basis.<br />

The first failover in server2<br />

Activation<br />

failure<br />

server1:<br />

Disk TUR monitor resource 1:<br />

Failover count 1<br />

Disk resource 1:<br />

Failover count Zero<br />

server2:<br />

Disk TUR Monitor Resource 1:<br />

Failover count Zero<br />

Disk Resource 1:<br />

Failover count 1<br />

Activating the disk resource<br />

1 due to the failover fails in<br />

server1.<br />

Server1:<br />

Disk TUR monitor resource 1:<br />

Failover count 1<br />

Disk resource 1<br />

Failover count Zero<br />

Server2:<br />

Disk TUR monitor resource 1<br />

Failover count Zero<br />

Disk resource 1<br />

Failover count 1<br />

An error can be detected in deactivation of the disk resource depending on the location of the<br />

disk device failure.<br />

<strong>ExpressCluster</strong> X <strong>2.0</strong> <strong>for</strong> <strong>Windows</strong> <strong>Reference</strong> <strong>Guide</strong>

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