Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 37)

For example, if a cluster has two volumes and each node owns one of the volumes, a typical scenario in an active/active
configuration (where virtual servers are running on each node) would be:
Node 1 owns Volume G.
Node 2 owns Volume H.
In this configuration, the administrator must use the PowerVault NAS Manager connect to node 1 to configure the Directory
Quota settings for Volume G, and then connect to node 2 to configure the Directory Quota settings for Volume H.
See the Dell PowerVault NAS Systems—Installing Storage Manager for Server Appliances document located on the Dell
Support website at support.dell.com for information on installing Directory Quota in your PowerVault NAS Manager.
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 SCSI 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
Two-node cluster with both 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 SCSI cluster.
Enable shadow copies in a NAS SCSI 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.