Command Reference Guide

Chapter 2: mx Commands 69

The mount options are:

RW/RO

Mount the filesystem read-write or read-only. RW is the default.

ASYNC/ SYNC

ASYNC, the default, allows either asychronous or synchronous I/O to the

filesystem. SYNC allows only synchronous I/O.

DEV/ NODEV

Interpret (or do not interpret) character or block special devices on the

filesystem. DEV is the default.

EXEC/ NOEXEC

Permit (or do not permit) the execution of binaries on the mounted

filesystem. EXEC is the default. NOEXEC can be used on a system that has

filesystems containing binaries for other architectures.

SUID/ NOSUID

Allow (or do not allow) set-user-id bits and set-group-id bits to take effect.

SUID is the default.

SHARED/ EXCLUSIVE

Either allow all servers having physical access to the filesystem to mount it

or allow only one server. SHARED is the default.

ORDERED/ UNORDERED

With the ORDERED option, 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.

ORDERED is the default.

CREATEDIR

Create the directory mount point.

localbrlocks

Disable cluster-coherent record locking. 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