Content Comparison

Online

In this status, you can access the source volume and perform a writing test properly.

Offline

Regardless of the mirror role, the LOCKVOLUME command is used to lock the volume. If the mirror volume is not defined, the LOCKVOLUME command is ignored and regarded as a failure.

Monitoring

Before monitoring, update the status of resource first. Perform a disk write test to determine the status of resource.
If the writing test is successful, it is regarded as the online state. If the writing test failed on the disk, it is regarded as the offline state.

Offline

Except for the online and trouble states, it is always offline.

Online

Type of operation is determined by the role of the mirror volume at the start node.
<Source volume> 1. You can unlock and write the volume. 2.To unlock, you can use the 'UNLOCKVOLUME' menu in the copy program. Check whether there are dirty bits.
<Target or NONE volume> 1. If the mirror role is target or NONE volume, run the SWITCHOVERVOLUME command.

Monitoring

Refer to the description of monitoring as above.

TroubleFault

If a writing test failed online, or an attempt to go online is failed, the trouble state is displayed.
*Failover deactivation state When a mirror network communication failure, target node or target disk failure occurs, the mirror state is changed from 'MIRRORING' to other, such as 'MIRROR_PAUSED'. If the mirror status is not 'MIRRORING', a failover will take place and it can cause data losses or damages. To prevent this problem, an agent deactivates the failover mode if the mirror status is not "MIRRORING". If the failover mode is deactivated, no failover will take place even if manual failover or troubles occur. If mirror network communication failures are recovered, and communication resumes, it will automatically perform RESYNC. When the mirror status is changed to MIRRORING, the failover mode will be also automatically activated.

Online

Refer to the above online command.

Offline

Regardless of the mirror role, the LOCKVOLUME command is used to lock the volume. If the mirror volume is not defined, the LOCKVOLUME command is ignored and regarded as a failure.