Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 9)

the Redirection After Boot option in the System Setup utility set to Enabled. To access the
System Setup utility press F2 during POST.
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Maximum Persistent Images in a Cluster Environment
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A maximum of 250 persistent images can be stored on
a NAS system. Therefore, in order to avoid having
over 250 persistent images on a cluster node after a
volume fails over, limit each node in a cluster to less
than 125 persistent images.
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Using PXE with your system and Cisco switches
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When using PXE, PowerVault 77xN systems are
incompatible with Cisco switches. If you are unable to
successfully perform PXE boot using your system and
it is connected to a Ciscso switch, try a non-Cisco
switch.
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Deleting virtual disks created using Array Manager
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Always use Array Manager to delete any virtual disks that you created using the Array Manager
(i.e. RAID-10 and RAID-50).
Also, remember to remove any shares, persistent images, and
volumes before deleting a virtual disk. If you delete a virtual disk using Array Manager without first
deleting the volume that resides on the virtual disk, creating a new volume in the NAS Manager may fail.
If this happens perform the following steps:
1) Start Array Manager
2) Click on the Disk View tab. If the virtual disk is labeled as Dynamic and Unknown Group,
right-click the virtual disk and click Convert to Basic.
3) Follow the wizard to convert the disk to basic.
4) In the left pane, expand Arrays and browse to the newly created virtual disk.
5) Delete the virtual disk.
6) Go back to the NAS Manager and try to create the volume.
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Refreshing web page causes volume name to appear as “((Null)) ((Null))”
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If you refresh the web page while you are creating a volume using the Web based Disks and Volumes,
the volume name may display as (Null) ((Null)) . This is because the volume has not yet been
formatted. Wait a few moments, and the volume name will display correctly.