How to Prepare the Cluster for Network Appliance NAS Device Maintenance

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

1. Stop I/O to the NAS device.

2. On each cluster node, unmount the NAS device directories.

3. Determine whether a LUN on this NAS device is a quorum device.

   # scstat -q

   • If no, 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, select and configure another quorum device.

     2. Remove this quorum device.

        See Chapter 5, Administering Quorum, in Sun Cluster System Administration Guide for Solaris OS for instructions about adding and removing quorum devices.

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        Note –

        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.

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