Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 40)

1. Start Cluster Administrator on the monitoring node.
2. Click the Start button and select Programs → Administrative Tools (Common)→ Cluster Administrator.
3. Open a connection to the cluster and observe the running state of each resource group. If a group has failed, one or more of its
resources might be offline.
Troubleshooting Failed Resources
Troubleshooting the failed resources is beyond the scope of this document, but examining the properties of each resource and ensuring that
the specified parameters are correct are the first two steps in this process. In general, if a resource is offline, it can be brought online by
right-clicking the resource and selecting Bring Online from the pull-down menu.
See the documentation and online help for Windows Storage Server 2003, Enterprise Edition for information about troubleshooting resource
failures.
Using Shadow Copies of Shared Folders
A shadow copy is a point-in-time copy of a shared file or folder. If you change a file on the active file system after making a shadow copy, the
shadow copy contains the old version of the file. If an active file gets corrupted or deleted, you can restore the old version by copying the file
from the latest shadow copy or restoring a directory or file.
NOTICE: Shadow copies are temporary backups of your data that typically reside on the same volume as your data. If the volume
becomes damaged and you lose your data, the shadow copy is also lost. Do not use shadow copies to replace scheduled or regular
backups. Table 2-4 provides a summary of shadow copies.
See the Dell PowerVault 77xN NAS Systems Administrator's Guide for more information on shadow copies.
You can create shadow copies of shared folders that are located on shared resources, such as a file server. When creating shadow copies of
shared folders on a NAS cluster running the Windows Storage Server 2003, Enterprise Edition operating system, note the information listed in
Table 2-6 .
See the Microsoft Support website at www.microsoft.com for more information on shadow copies for shared folders.
Table 2-6. Creating Shadow Copies
Cluster Type/Task Description Action
Single quorum device
cluster
A cluster with all nodes connected to
a storage system with a physical
disk resource.
Create and manage shadow copies on the physical disk resource.
NOTE: The Volume Shadow Copy Service Task resource type can be used to
manage shadow copies in a NAS cluster, but requires a dependency on the
physical disk resource.
Scheduled tasks that
generate volume
shadow copies.
Creates a shadow copy of an entire
volume.
Run the scheduled task on the same node that owns the volume.
NOTE: The cluster resource that manages the scheduled task must be able
to fail over with the physical disk resource that manages the storage volume.
Shadow Copy Considerations
When using shadow copies, note the following:
To avoid disabling and re-enabling shadow copies, enable shadow copies after you create your NAS cluster.
Enable shadow copies in a NAS cluster when user access is minimal—for example, during nonbusiness hours. When you enable shadow
copy volumes, the shadow copy volumes and all dependent resources go offline for a brief period of time, which may impact client
system access to user resources.
Managing Shadow Copies