3.5.1 Matrix Server Administration Guide

Chapter 8: Configure MxFS-Linux 145

Virtual NFS Service will be up than on the node currently hosting the

Virtual NFS Service.)

When you click OK on the “Create a Spanning Set of Virtual NFS

Services” dialog, you will return to the Add Export Group dialog. Then

click Apply or OK to create the Export Group, or configure the advanced

options for the high-availability monitor as described under “Advanced

Options for Export Group Monitors” on page 146.

High-Availability Monitors

MxFS-Linux provides two types of monitors that ensure high-availability

for exported NFS filesystems: a global NFS monitor and Export Group

monitors.

Global NFS Monitor

The global NFS monitor periodically checks the status of the NFS service

and the virtual MxFS-Linux processes on each node. If the monitor

detects that the NFS service or a MxFS-Linux process is not available on a

particular node, any Virtual NFS Services currently active on that node

will fail over to a backup. The Export Group monitors on the node

experiencing the failure will report a

DOWN status and the associated

error information.

You can configure the probe settings for this monitor. See “Configure the

Global NFS Probe Settings” on page 156 for more information.

Export Group Monitor

An Export Group monitor is active on each node associated with the

Export Group. This monitor periodically tests whether each exported

filesystem path contains a mounted PSFS filesystem. If the filesystem is

not mounted, the monitor probe reports a

DOWN status. Depending on

your configuration, any Virtual NFS Services that are exporting the

filesystem and are active on the node will be failed over to a backup node

where the filesystem is mounted.

NOTE: If a filesystem path does not exist, the monitor issues a warning. A

deleted export path should be either recreated or removed from

the Export Group at the administrator’s earliest convenience.