Sun Storage 2510 Array
 
Sun Storage 2540-M2 Array
 
Sun Storage 2540 Array
 
Sun Storage Common Array Manager (CAM)
 
Sun Storage 6130 Array
 
Sun Storage 6780 Array
 
Sun Storage 6180 Array
 
Sun Storage 2530 Array
 
Sun Storage 2530-M2 Array
 
Sun Storage 6540 Array
 
Sun Storage 6140 Array
 
Sun Storage 6580 Array
 

PLA-Support>Sun Systems>DISK>Disk Software>SN-DK: CAM
 

Applies to:

Goal

This document describes the functionality of the Access Volume on Sun Storage 2500, 6000 and 2500-M2 arrays, and how to administer it using Sun Storage Common Array Manager (CAM).

Solution

What is the Access Volume?

The Access Volume is also known as the UTM LUN (Universal Transport Mechanism Logical Unit), or LUN 31. It is a special volume that is used by the host-agent software to communicate management requests and event information between the management station and the storage array. It exists on the array by default and cannot be deleted, created, or accessed for I/O.

When is the Access Volume needed?

The Access Volume is required only for in-band management and is mapped by default to each storage domain as LUN 31. If the array is being managed out-of-band, the Access Volume is not needed and can be removed from view of the OS by deleting the mapping(s) using the management software, for example Sun Storage Common Array Manager (CAM). With new arrays, the mapping of the Access Volume to the default domain is set at the factory.

Can I format, label and use the Access Volume to store data?

No. The Access Volume cannot be modified, deleted, created, or accessed for normal I/O. Because a label cannot be applied, error messages may be logged to /var/adm/messages. For details, refer to <Document 1477987.1> "Corrupt Label, Wrong Magic Number" error seen on LUN 31 devices from Oracle storage arrays.

How can I tell what the Access Volume looks like from the OS?

The Access Volume will be labeled with "SUN UniversalXport" or "Volume Access".

Example from Solaris:

Example from Windows:

I want to switch from out-of-band management to in-band management but my Access Volume is not mapped. How do I get it back?

To map the Access Volume to a host using CAM :

1. Select the Storage System on the left-hand pane and expand its list of pages.
2. Click on the "Mappings" page for the array. It will appear in the right-hand pane.
3. Click the "New" button. A pop-up window will appear.
4. In the "Volume/Snapshot name contains" field, type "Access" and click "Next".
5. Check the box next to "Access", choose "31" from the drop-down menu under "LUN", and then click "Next".
6. Select the host you are using for in-band management and then click "Next".
7. Finally, review your selections and confirm using the "Finish" button.

If I do not need the Access Volume, how do I delete it?

You cannot delete the Access Volume. You can remove view of the Access Volume from the OS by deleting the mapping from the management software.

To delete the mapping of the Access Volume to a host using CAM:

1. Select the Storage System on the left-hand pane and expand its list of pages.
2. Click on the "Mappings" page for the array. It will appear in the right-hand pane.
3. Find the volume named "Access" in the list of mappings for the host or its associated host group and check the box next to it.
4. Click the "Delete" button.

For additional information on in-band management, please refer to the Array Administration Guide for your version of CAM on the Oracle Technology Network's Disk Device Software Documentation page.

References

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