rsize=n-
The number of bytes NFS uses when reading files
from an NFS server. The default value is dependent on
the kernel, currently 1024 bytes. (However,
throughput is improved greatly by asking for
rsize=8192.)
wsize=n-
The number of bytes NFS uses when writing files to
an NFS server. The default value is dependent on the
kernel, currently 1024 bytes. (However, throughput is
improved greatly by asking for wsize=8192.)
timeo=n-
The value in tenths of a second before sending the
first retransmission after an RPC timeout. The
default value is 7 tenths of a second. After the
first timeout, the timeout is doubled after each
successive timeout until a maximum timeout of 60
seconds is reached or the enough retransmissions have
occured to cause a major timeout. Then, if the
filesystem is hard mounted, each new timeout cascade
restarts at twice the initial value of the previous
cascade, again doubling at each retransmission. The
maximum timeout is always 60 seconds. Better overall
performance may be achieved by increasing the timeout
when mounting on a busy network, to a slow server, or
through several routers or gateways.
retrans=n-
The number of minor timeouts and retransmissions
that must occur before a major timeout occurs. The
default is 3 timeouts. When a major timeout occurs,
the file operation is either aborted or a "server not
responding" message is printed on the console.
acregmin=n-
The minimum time in seconds that attributes of a
regular file should be cached before requesting fresh
information from a server. The default is 3
seconds.
acregmax=n-
The maximum time in seconds that attributes of a
regular file can be cached before requesting fresh
information from a server. The default is 60
seconds.
acdirmin=n-
The minimum time in seconds that attributes of a
directory should be cached before requesting fresh
information from a server. The default is 30
seconds.
acdirmax=n-
The maximum time in seconds that attributes of a
directory can be cached before requesting fresh
information from a server. The default is 60
seconds.
actimeo=n-
Using actimeo sets all of acregmin, acregmax, acdirmin, and
acdirmax to
the same value. There is no default value.
retry=n-
The number of minutes to retry an NFS mount
operation in the foreground or background before
giving up. The default value is 10000 minutes, which
is roughly one week.
namlen=n-
When an NFS server does not support version two of
the RPC mount protocol, this option can be used to
specify the maximum length of a filename that is
supported on the remote filesystem. This is used to
support the POSIX pathconf functions. The default is
255 characters.
port=n-
The numeric value of the port to connect to the
NFS server on. If the port number is 0 (the default)
then query the remote host's portmapper for the port
number to use. If the remote host's NFS daemon is not
registered with its portmapper, the standard NFS port
number 2049 is used instead.
mountport=n-
The numeric value of the mountd port.
mounthost=name-
The name of the host running mountd .
mountprog=n-
Use an alternate RPC program number to contact the
mount daemon on the remote host. This option is
useful for hosts that can run multiple NFS servers.
The default value is 100005 which is the standard RPC
mount daemon program number.
mountvers=n-
Use an alternate RPC version number to contact the
mount daemon on the remote host. This option is
useful for hosts that can run multiple NFS servers.
The default value is version 1.
nfsprog=n-
Use an alternate RPC program number to contact the
NFS daemon on the remote host. This option is useful
for hosts that can run multiple NFS servers. The
default value is 100003 which is the standard RPC NFS
daemon program number.
nfsvers=n-
Use an alternate RPC version number to contact the
NFS daemon on the remote host. This option is useful
for hosts that can run multiple NFS servers. The
default value is version 2.
nolock-
Disable NFS locking. Do not start lockd. This has
to be used with some old NFS servers that don't
support locking.
bg-
If the first NFS mount attempt times out, retry
the mount in the background. After a mount operation
is backgrounded, all subsequent mounts on the same
NFS server will be backgrounded immediately, without
first attempting the mount. A missing mount point is
treated as a timeout, to allow for nested NFS
mounts.
fg-
If the first NFS mount attempt times out, retry
the mount in the foreground. This is the complement
of the bg
option, and also the default behavior.
soft-
If an NFS file operation has a major timeout then
report an I/O error to the calling program. The
default is to continue retrying NFS file operations
indefinitely.
hard-
If an NFS file operation has a major timeout then
report "server not responding" on the console and
continue retrying indefinitely. This is the
default.
intr-
If an NFS file operation has a major timeout and
it is hard mounted, then allow signals to interupt
the file operation and cause it to return EINTR to
the calling program. The default is to not allow file
operations to be interrupted.
posix-
Mount the NFS filesystem using POSIX semantics.
This allows an NFS filesystem to properly support the
POSIX pathconf command by querying the mount server
for the maximum length of a filename. To do this, the
remote host must support version two of the RPC mount
protocol. Many NFS servers support only version
one.
nocto-
Suppress the retrieval of new attributes when
creating a file.
noac-
Disable all forms of attribute caching entirely.
This extracts a server performance penalty but it
allows two different NFS clients to get reasonable
good results when both clients are actively writing
to common filesystem on the server.
tcp-
Mount the NFS filesystem using the TCP protocol
instead of the default UDP protocol. Many NFS servers
only support UDP.
udp-
Mount the NFS filesystem using the UDP protocol.
This is the default.
