Sun Cluster 3.0 Hardware Guide

Configuring StorEdge A3500 Disk Drives After Sun Cluster Install

This section provides the procedures for configuring an StorEdge A3500 disk array. The following table lists these procedures. Perform these procedures after installing Sun Cluster software.

Configuring StorEdge A3500 disk array disk drives before installing Sun Cluster software is no different than doing so in a non-cluster environment. For procedures on configuring StorEdge A3500 disk drives before installing Sun Cluster, see Sun StorEdge RAID Manager User's Guide.

Table 7-2 Task Map: Configuring StorEdge A3500 Disk Drives


Task	For Instructions, Go To...
Create a logical unit number (LUN) On one node, follow the same procedure used in a non-cluster environment, then use the `scgdevs` command to update the global device namespace.	Sun StorEdge RAID Manager User's Guide "How to Create a LUN"
Remove a LUN On one node, follow the same procedure used in a non-cluster environment, then use the `scdidadm -C` command to remove obsolete DIDs.	Sun StorEdge RAID Manager User's Guide "How to Remove a LUN"
Rebalance existing LUNs Follow the same procedure used in a non-cluster environment.	Sun StorEdge RAID Manager User's Guide
Reset StorEdge A3500 configuration On one node, follow the same procedure used in a non-cluster environment, then use the `scgdevs` command to update the global device namespace, and the `scdidadm -C` command to remove obsolete DIDs.	Sun StorEdge RAID Manager User's Guide "How to Reset StorEdge A3500 Configuration"
Create a hot spare Follow the same procedure used in a non-cluster environment.	Sun StorEdge RAID Manager User's Guide
Delete a hot spare Follow the same procedure used in a non-cluster environment.	Sun StorEdge RAID Manager User's Guide
Increase the drive capacity of a LUN If a volume manager manages the LUN, run the appropriate Solstice DiskSuite or VERITAS Volume Manager commands to remove the LUN form any diskset or disk group, then follow the same procedure used in a non-cluster environment. Afterward, you can return the LUN to a diskset or disk group.	Sun StorEdge RAID Manager User's Guide

How to Create a LUN

Use this procedure to create a logical unit number (LUN) from unassigned disk drives or remaining capacity.

This product supports the use of hardware RAID and host-based software RAID. For host-based software RAID, this product only supports RAID levels 0+1 and 1+0. You must use hardware RAID for Oracle Parallel Server (OPS) data stored on the StorEdge A3500. Also, do not place OPS data under volume management control. You must place all other data stored on the StorEdge A3500 under volume management control. Use either hardware RAID, host-based software RAID, or both to manage your non-OPS data.

Hardware RAID uses the StorEdge A3500's hardware redundancy to ensure that independent hardware failures do not impact data availability. Host-based software RAID ensures that independent hardware failures do not impact data availability when an entire StorEdge A3500 is offline by mirroring across separate StorEdge A3500 disk arrays. Although you can use hardware RAID and host-based software RAID concurrently, you only need one RAID solution to maintain a high degree data availability.

If you use host-based software RAID, it is important to identify the impact of StorEdge A3500 LUN configuration and hardware maintenance procedures on the availability of LUNs. If you use StorEdge A3500's hardware RAID, you can perform most maintenance procedures in "Maintaining a StorEdge A3500 Disk Array" without volume management disruptions. However, if you use host-based software RAID without hardware RAID, some maintenance procedures in "Maintaining a StorEdge A3500 Disk Array" will require additional volume management administration because the availability of the LUNs being used by the volume manager may be impacted.

On one node, with all cluster nodes booted and attached to the StorEdge A3500, create a LUN.

Shortly after the LUN formatting completes, a logical name for the new LUN appears in /dev/rdsk on all cluster nodes attached to the StorEdge A3500 array.

For the procedure on creating a LUN, see Sun StorEdge RAID Manager User's Guide.

Note -
The RAID Manager 6.x graphical user interface does not consistently display Solaris logical device names. Use the format(1M) command to verify Solaris logical device names.

After the new logical name you created in Step 1 appears in /dev/rdsk on all cluster nodes, on one node, update the global device namespace.
# scgdevs

If you want a volume manager to manage the new LUN you created in Step 1, run the appropriate Solstice DiskSuite and VERITAS Volume Manager commands to incorporate the new LUN into a diskset or disk group.

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

How to Remove a LUN

Caution -

This procedure removes all data on the LUN you remove.

Migrate all Oracle Parallel Server (OPS) tables, data services, and volumes off of the logical unit number (LUN) you want to remove.

If a volume manager does not manage the LUN you want to remove, proceed to Step 3. Otherwise, run the appropriate Solstice DiskSuite or VERITAS Volume Manager commands to remove the LUN from any diskset or disk group.

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

From one node, remove a LUN

For the procedure on removing a LUN, see Sun StorEdge RAID Manager User's Guide.

On all nodes, run the scdidadm command to remove all obsolete DIDs.
# scdidadm -C

How to Reset StorEdge A3500 Configuration

Caution -

This procedure creates a default logical unit number (LUN) that removes all LUN configuration. All LUN configuration and associated data will be lost on the LUNs you remove.

Migrate all Oracle Parallel Server (OPS) tables, data services, and volumes off of the LUNs you want to remove.

If a volume manager does not manage any LUNs on the StorEdge A3500 you want to reset, proceed to Step 3. Otherwise, run the appropriate Solstice DiskSuite or VERITAS Volume Manager commands to remove the LUN(s) from any diskset or disk group.

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

On one node, reset the StorEdge A3500 configuration.

For the procedure for resetting StorEdge A3500 configuration, see Sun StorEdge RAID Manager User's Guide.

Note -
The RAID Manager 6.x graphical user interface does not consistently display Solaris logical device names. Use the format command to verify Solaris logical device names.

Using the format command, specify the Solaris logical device name, then label the new LUN 0 disk.

On all nodes, run the scdidadm command to remove all obsolete DIDs.
# scdidadm -C

One at a time, boot each node.
# boot -r
LUN 0 receives a new DID.