How to Create and Map a LUN

Use this procedure to create a LUN from unassigned storage capacity.

Before You Begin

This procedure relies on the following prerequisites and assumptions.

• All nodes are booted in cluster mode and attached to the storage device.

• The storage device is installed and configured If you are using multipathing, it is configured as described in the installation procedure.

• If you are using Sun StorEdge Traffic Manager, it is installed and configured and the path between Traffic Manager and the storage device is functioning.

Steps

1. Follow the instructions in your storage device's documentation to create and map the LUN.

   To allow multiple clusters and nonclustered systems to access the storage device, create initiator groups by using LUN filtering or masking.

2. Are you using multipathing?

   • If yes, proceed to Step 3.

   • If no, skip to Step 4.

3. Are any devices that are associated with the LUN you created at an unconfigured state?

   # cfgadm -al | grep disk

   • If no, proceed to Step 4.

   • If yes, configure the STMS paths on each node that is connected to the storage device.

     cfgadm -o force_update -c configure controllerinstance

     For the procedure about how to configure STMS paths, see the Sun StorEdge Traffic Manager Installation and Configuration Guide.

4. On one node that is connected to the storage device, use the format command to label the new LUN.

5. From any node in the cluster, update the global device namespace.

   # scgdevs

   ---

   Note –

   You might have a volume management daemon such as vold running on your node, and have a CD-ROM drive connected to the node. Under these conditions, a device busy error might be returned even if no disk is in the drive. This error is expected behavior. You can safely ignore this error message.

   ---

6. If you will manage this LUN with volume management software, use the appropriate Solstice DiskSuite/Solaris Volume Manager or VERITAS Volume Manager commands to update the list of devices on all nodes that are attached to the new volume that you created.

   For more information, see your Solstice DiskSuite/Solaris Volume Manager or VERITAS Volume Manager documentation.

See Also

• To configure a LUN as a quorum device, see Chapter 5, Administering Quorum, in Sun Cluster System Administration Guide for Solaris OS.

• To create a new resource or configure a running resource to use the new LUN, see Chapter 2, Administering Data Service Resources, in Sun Cluster Data Services Planning and Administration Guide for Solaris OS.