Sun Cluster 2.2 System Administration Guide

Chapter 13 Administering Sun StorEdge A3x00s and Sun StorEdge A1000s

This chapter provides instructions for administering the Sun StorEdge A3x00 and Sun StorEdge A1000 expansion units and disks included in your Sun Cluster configuration. Both expansion units support RAID5 hardware. The Sun StorEdge A3x00 has two RAID5 controllers, and the Sun StorEdge A1000 has only one. Most administration procedures are the same for both expansion units.

Use the service manual for your Sun StorEdge A3x00 or Sun StorEdge A1000 disks, and your volume management software documentation, when you are replacing or repairing disk hardware in the Sun Cluster configuration.

Power Sources

The Sun StorEdge A3x00 or Sun StorEdge A1000 disk expansion unit includes redundant power sequencers. Each power sequencer supplies power to half of the expansion unit's components, so power loss to one of these power sources does not affect system availability. The controller module has redundant power supplies, so a single power failure in the controller module also will not affect system availability.

There are no special procedures required by Sun Cluster to recover in the event of a failure of the entire disk expansion unit. Follow the procedures in the disk expansion service manual to bring them back into service.

Adding Sun StorEdge A3x00 or Sun StorEdge A1000 Enclosures

This section describes procedures used to add a Sun StorEdge A3x00 or a Sun StorEdge A1000 expansion unit. These procedures can be done with the Sun Cluster up and running.

Note -

To upgrade the firmware in expansion units, refer to the hardware service manual for your system.

How to Add a Disk Enclosure

Switch over all logical hosts to one of the Sun Cluster nodes in the cluster that will be receiving the new disk enclosure.
phys-hahost1# haswitch phys-hahost2 hahost1 hahost2

Stop Sun Cluster on the node that no longer masters any logical hosts.
phys-hahost1# scadmin stopnode

Add the disk interface card (UDWIS) to the Sun Cluster node.

Use the instructions that come with the UDWIS interface card.

Cable the new UDWIS card to the disk enclosure.

Perform a reconfiguration reboot on the node with the new UDWIS card.
phys-hahost1# boot -r

Start Sun Cluster on the node.
phys-hahost1# scadmin startnode

Switch over the logical hosts to another node in the cluster.
phys-hahost1# haswitch phys-hahost1 hahost1 hahost2

Perform Step 2 through Step 6 on the node that no longer masters the logical hosts.

Configure the disk subsystems into the cluster.

Use the expansion unit and VxVM documentation to set up the disk configuration.

Run the haswitch(1M) command on both nodes to incorporate the new configuration into Sun Cluster.
# haswitch -r

Administering Sun StorEdge A3x00 or Sun StorEdge A1000 Disks

The procedures for administering Sun StorEdge A3x00 or Sun StorEdge A1000 disks in a Sun Cluster configuration are identical to those used with nodes that are not clustered. Refer to your expansion unit documentation for procedures to add, replace, or repair disks or disk components in your disk expansion unit.

Adding a Sun StorEdge A3x00 or Sun StorEdge A1000 Disk

When adding drives to a Sun StorEdge A3x00 or a Sun StorEdge A1000, add the drives while the system is up and running. Do not reboot the system. Doing so may cause a loss of configuration information on the new drives, and a loss of data and logical unit (LUN) configuration on the existing drives.

If you do see a problem, such as not seeing pre-existing LUNs after adding drives and rebooting the system, then remove the newly-added drives, restart the system, then add them one at a time.

This problem does not occur when the drives are added to an "unused" disk group on a running system, after which it is safe to reboot the system. Because hot-plugging is fully supported on the Sun StorEdge A3x00 and the Sun StorEdge A1000, this is the accepted procedure.

Replacing a Sun StorEdge A3x00 or Sun StorEdge A1000 Disk

The Sun Cluster sees Sun StorEdge A3x00 or Sun StorEdge A1000 disks as logical units (LUNs) and not as physical disks. Because of this:

As long as the LUN is available, no action is necessary when replacing a failed physical disk.
If the LUN is not available (or not in an optimal state) and was used as a quorum device, you need to use the scconf -q command to change the quorum device to a different LUN (disk) before proceeding with the disk replacement procedure.

For additional information regarding logical units and physical disks, refer to your expansion unit documentation. See also Chapter 3 and Chapter 9 in the Sun Cluster 2.2 Hardware Service Manual.

Note that some administrative procedures on the Sun StorEdge A3x00 or Sun StorEdge A1000s require replacement of UDWIS cards. For this procedure, see Chapter 12 in the Sun Cluster 2.2 Hardware Service Manual.