HP StorageWorks Storage Mirroring Recover User's Guide (T5437-96008, November 2009)

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Monitoring a cluster workload
In a standard cluster configuration, where a single copy of data resides on a SCSI disk
that is shared between cluster nodes, the Double-Take Source Connection resource
keeps the data synchronized between your source and target. Use the standard
Windows cluster tools to monitor the status of the resource.
In a GeoCluster configuration, where data is stored on volumes local to each node and
replicated to each node in the cluster, the GeoCluster Replicated Disk resource keeps
the data synchronized between nodes of the cluster. You should also use the standard
Windows cluster tools to monitor the status of the resource, but you should also use the
following information to help you monitor the GeoCluster Replication Disk resource.
Resolving an online pending GeoCluster Replicated Disk resource
When the GeoCluster Replicated Disk resource is in an online pending state, you are
protected from possible data corruption. If you are using Windows 2003, review the
description of the GeoCluster Replicated Disk Status resource to see why the
GeoCluster Replicated Disk resource is in the online pending state. If you are using
Windows 2008, you can see the online pending status directly in the description of the
GeoCluster Replicated Disk resource. If the pending state were bypassed, the node
where you are trying to bring the resource online would have incomplete data, which
would then be replicated to the other nodes in the cluster. This state safeguards you from
corrupting your data.
There are different options for resolving an online pending state, depending on whether
your operating system supports snapshots. Therefore, some of the following options may
not be displayed or may be disabled if they are not valid for your configuration.
If you are using Windows 2003, right-click on the online pending resource and select the
desired control.
If you are using Windows 2008, right-click the online pending resource, select
Properties, select the Online Pending tab, and click the desired control button.
Windows
2003
Windows
2008
Description
Revert to
snapshot
Revert
Snapshot
If you have a snapshot of the target data available, you can
revert to that data. If you revert to a snapshot, any data changes
made after the snapshot’s specified date and time will be lost.
A Storage Mirroring Recover connection will be established to
replicate the node’s data (at the snapshot point-in-time) to the
other nodes.