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NAMEmount_cachefs: mount, umount — mount and unmount CacheFS file systems SYNOPSIS/sbin/fs/cachefs/mount
[-F
cachefs]
[-rqOV]
-o backfstype=file_system_type
[specific_options]
resource
mount_point /sbin/fs/cachefs/umount
mount_point DESCRIPTIONThe
mount
utility attaches a named
resource
to the file system hierarchy
at the pathname location
mount_point,
which must already exist.
If
mount_point
has any contents prior to the
mount
operation, the contents remain hidden until the
resource
is once again unmounted.
The CacheFS-specific version of the
mount
command mounts a cached file system; if necessary,
it NFS-mounts its back file system.
It also provides a number of options that are
CacheFS-specific for controlling the caching process. CacheFS can be used only with NFSv2 or NFSv3.
It cannot be used with NFSv4.
If NFSv4 is enabled by default CacheFS mount fails,
unless the user specifies that
vers
is 2 or 3.
See
mount_nfs(1M)
for the description of
vers. The
umount
utility unmounts mounted file systems. Only a superuser can mount and unmount file systems. See
mount_nfs(1M)
for the description of
resource. Options (mount)See
mount(1M)
for the description of the
-rFV
options.
- -o specific_options
Set file system specific options according to a comma-separated
list with no intervening spaces.
Notice that the
backfstype
argument must be specified.
- acdirmax=n
Specifies that cached attributes are held for no more than
n
seconds after directory update.
After
n
seconds, all directory information is purged from the cache.
The default value is
30
seconds. - acdirmin=n
Specifies that cached attributes are held
for at least
n
seconds after directory update.
After
n
seconds, CacheFS checks to see
if the directory modification time on the back file system has changed.
If it has, all information about the directory is purged from the cache
and new data is retrieved from the back file system.
The default value is
30
seconds. - acregmax=n
Specifies that cached attributes are held for no more than
n
seconds after file modification.
After
n
seconds, all file information is purged from the cache.
The default value is
30
seconds. - acregmin=n
Specifies that cached attributes are held for at least
n seconds
after file modification.
After
n seconds,
CacheFS checks to see
if the file modification time on the back file system has changed.
If it has, all information about the file is purged from the cache
and new data is retrieved from the back file system.
The default value is
30
seconds. - actimeo=n
Sets
acregmin,
acregmax,
acdirmin,
and
acdirmax
to n. - backfstype=file_system_type
The file system type of the back file system (for
example,
nfs). - backpath=path
Specifies where the back file system is already mounted.
If this argument is not supplied, CacheFS
determines a mount point for the back file system. - cachedir=directory
The name of the cache directory. - cacheid=ID
ID
is a string specifying a particular instance of a cache.
If you do not specify a cache ID, CacheFS will
construct one. - demandconst
Verifies cache consistency only when explicitly
requested, rather than periodic checking that is
done by default.
A consistency check is requested by using the
-s
option of the
cfsadmin
command.
This option is useful for back file systems that change
infrequently, for example,
/usr/bin.
The
demandconst,
noconst,
and
weakconst
are mutually exclusive. - local-access
Causes the front file system to interpret the mode bits
used for access checking instead of having the back
file system verify access permissions.
Do not use this argument with secure NFS . - noconst
Disables cache consistency checking.
By default, periodic consistency checking is enabled.
Specify
noconst
only when you know that the back file system
will not be modified.
Trying to perform cache consistency check using
cfsadmin -s
will result in error.
The
demandconst,
noconst,
and
weakconst
are mutually exclusive. - purge
Purge any cached information for the specified file
system. - remount
Remounts a read-only file system as read-write (using
the rw option). - rpages
If specified when mounting a CacheFS file system, a
binary will be read and populated in the cache the
first time it is loaded.
Subsequent access to the
binary will be satisfied from the cache. - rw | ro
Read-write (default) or read-only. - suid | nosuid
Allow (default) or disallow set-uid execution. - weakconst
Verifies the cache consistency with the NFS client's
copy of file attributes, and coordinates with bakfs (NFS)
for delayed flushing of modified pages to the server.
The delayed flushing of pages improves CacheFS response times.
The
weakconst
must not be used when multiple clients are modifying
the same file.
The
demandconst,
noconst,
and
weakconst
options are mutually exclusive. - write-around | non-shared
Write modes for CacheFS.
The
write-around
mode (the default) handles writes the same as NFS does;
that is, writes are made to the back file system, and the
affected file is purged from the cache.
You can use the
non-shared
mode when you are sure that no one else will be writing
to the cached file system.
In this mode, all writes are
made to both the front and the back file system, and
the file remains in the cache.
- -O
Overlay mount.
Allow the file system to be mounted over an existing mount point,
making the underlying file system inaccessible.
If a mount is attempted on a pre-existing
mount point without setting this flag, the mount
will fail, producing the error "device busy". - -q
When processing an unknown
specific_option,
the
mount
utility prints a warning message and processes the next one.
This option prevents printing the warning message.
EXAMPLESCacheFS-mount the file system
server1:/user2,
which is already NFS-mounted on
/usr/abc
as
/xyz.
mount -F cachefs -o backfstype=nfs,backpath=/usr/abc, \
cachedir=/cache1 server1:/user2 /xyz Lines similar to the following appear in the
/etc/mnttab
file after the
mount
command is executed:
server1:/user2 /usr/abc nfs
/usr/abc /cache1/xyz cachefs backfstype=nfs Mount a CacheFS filesystem over NFS Version 2.
mount -F cachefs -o vers=2,backfstype=nfs,cachedir=/cache1 \
server1:/user2 /xyz AUTHORmount_cachefs
was developed by Sun Microsystems, Inc. |
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