How to Prepare the Cluster for Oracle ZFS Storage Appliance NAS Device Maintenance

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Follow the instructions in this procedure whenever the Oracle ZFS Storage Appliance NAS device maintenance you are performing might affect the device's availability to the cluster nodes.

Caution - If your cluster requires a quorum device (for example, a two-node cluster) and you are maintaining the only shared storage device in the cluster, your cluster is in a vulnerable state throughout the maintenance procedure. Loss of a single node during the procedure causes the other node to panic and your entire cluster becomes unavailable. Limit the amount of time for performing such procedures. To protect your cluster against such vulnerability, add a shared storage device to the cluster.

Before You Begin

To perform this procedure, assume the root role or a role that provides solaris.cluster.read and solaris.cluster.modify authorization.

Stop I/O to the Oracle ZFS Storage Appliance NAS device.
If you have data services using NFS file systems from the Oracle ZFS Storage Appliance, bring the data services offline and disable the resources for the applications using those file systems. On each node, ensure that no existing processes are still using any of the NFS file systems from the device.
On each cluster node, unmount the NFS file systems from the Oracle ZFS Storage Appliance NAS device.
If you have a resource of type SUNW.ScalMountPoint managing the file system, disable that resource.

Note - For more information on disabling a resource, see How to Disable a Resource and Move Its Resource Group Into the UNMANAGED State in Oracle Solaris Cluster 4.3 Data Services Planning and Administration Guide.
If that resource is not configured, use the Oracle Solaris umount (1M) command. If the file system cannot be unmounted because it is still busy, check for applications or processes that are still on that file system, as explained in Step 1 You can also force the unmount by using the –f option with the umount command.
Determine whether a LUN on this Oracle ZFS Storage Appliance NAS device is a quorum device.
```
# clquorum show
```
If the LUNs on this NAS device are not quorum devices, you are finished with this procedure.
If a LUN is a quorum device, perform the following steps:
1. If your cluster uses other shared storage devices or a quorum server, select and configure another quorum device.
2. Remove this quorum device.
  See Chapter 6, Administering Quorum in Oracle Solaris Cluster 4.3 System Administration Guide for instructions on adding and removing quorum devices.