| Option |
Description |
| rw |
It allows both read and write requests on a NFS volume. |
| ro |
It allows only read requests on a NFS volume. |
| sync |
It replies to requests only after the changes
have been committed to stable storage. (Default)
|
| async |
This option allows the NFS server to violate the NFS protocol
and reply to requests before any changes made by that request have been committed to stable storage.
|
| secure |
This option requires that requests originate
on an Internet port less than IPPORT_RESERVED (1024). (Default) |
| insecure |
This option accepts all ports. |
| wdelay |
It delays committing a write request to disc slightly
if it suspects that another related write request may be in progress or may arrive soon. (Default)
|
| no_wdelay |
This option has no effect if async is also set.
The NFS server will normally delay committing a write request to disc slightly if it suspects that
another related write request may be in progress or may arrive soon.
This allows multiple write requests to be committed to disc with the one operation which
can improve performance. If an NFS server received mainly small unrelated requests,
this behaviour could actually reduce performance, so no_wdelay is available to turn it off.
|
| subtree_check |
This option enables subtree checking. (Default)
|
| no_subtree_check |
This option disables subtree checking,
which has mild security implications, but can improve reliability in some circumstances.
|
| root_squash |
It maps requests from uid/gid 0 to the anonymous uid/gid.
Note that this does not apply to any other uids or gids that might be equally sensitive, such as user bin or group staff.
|
| no_root_squash |
It turns off root squashing. This option is mainly useful for
disk-less clients.
|
| all_squash |
It maps all uids and gids to the anonymous user.
Useful for NFS exported public FTP directories, news spool directories, etc.
|
| no_all_squash |
It turns off all squashing. (Default)
|
| anonuid=UID |
These options explicitly set the uid and gid of the
anonymous account. This option is primarily useful for PC/NFS clients, where you might want all requests appear to be from one user.
As an example, consider the export entry for /home/joe in the example section below, which maps all requests to uid 150.
|
| anongid=GID |
It reads above (anonuid=UID) |