3.1.2 Matrix Server Administration Guide

Chapter 7: Configure PSFS Filesystems 100

The advanced mount options are as follows:

Shared or Exclusive. Either allow all servers having physical access to the

filesystem to mount it or allow only one server. Shared is the default.

Ordered or Unordered. The Ordered option provides additional security

for writes to the filesystem. If a metadata operation will allocate user

blocks, the user blocks are written to the filesystem before the metadata is

written. With the Unordered option, the writes can occur in either order.

The default is Ordered.

Enable Cluster Coherent Record Locks. Cluster-coherent record locking

is enabled by default. To disable cluster-coherent locking on all nodes in

the matrix, remove the checkmark from the “Enable Cluster Coherent

Record Locks” option.

NOTE: This mount option should be used with extreme caution. When

cluster-coherent record lock operations are disabled, the record

locks established against a file in the filesystem by each node in

the cluster are invisible to all other nodes in the same cluster.

Before using this option, ensure that either all processes

performing record lock operations in the affected filesystem are

running on the same single node in the cluster, or that the

necessary mutual exclusion semantics for record locking have

been implemented in some other way. Note that this option affects

record locks obtained by the Linux fcntl system call. The Linux

flock system call is not affected.

Custom Mount Options: Specify any custom mount options, separated

by commas.

Mount a Filesystem from the Command Line

To mount a PSFS filesystem from the command line, use one of the

following commands.

The Matrix Server mx Command

Use this syntax:

mx fs mount [--persist] [--activate] [--options

<option>,<option>,...] --path <path> <filesystem> <server> ...