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System Administration Commands mount_cachefs(1M)
NAME
mount_cachefs - mount CacheFS file systems
SYNOPSIS
mount -F cachefs [generic_options] -o
backfstype=file_system_type [specific_options] [-O] special
mount_point
DESCRIPTION
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 CacheFS-specific
options for controlling the caching process. For more infor-
mation regarding back file systems, refer to the System
Administration Guide: Basic Administration.
mount_cachefs cannot be used with replicated NFS mounts.
mount_cachefs creates a pass through when used with an NFS
version 4 mount. No caching is performed.
OPTIONS
To mount a CacheFS file system, use the generic mount com-
mand with the -F option followed by the argument cachefs.
See mount(1M) for a list of supported generic_options.
-o specific_options
Specify CacheFS file system specific options in a
comma-separated list with no intervening spaces.
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 direc-
tory is purged from the cache and new data is
retrieved from the back file system. The default
value is 30 seconds.
SunOS 5.10 Last change: 18 Mar 2004 1
System Administration Commands mount_cachefs(1M)
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 modifica-
tion 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 (can be
nfs or hsfs).
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.
The back file system must be read-only.
cachedir=directory
The name of the cache directory.
cacheid=ID
SunOS 5.10 Last change: 18 Mar 2004 2
System Administration Commands mount_cachefs(1M)
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 the periodic checking that is
done by default. A consistency check is requested by
using the -s option of the cfsadmin(1M) command.
This option is useful for back file systems that
change infrequently, for example, /usr/openwin.
demandconst and noconst 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 con-
sistency check using cfsadmin -s will result in
error. demandconst and noconst 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.
SunOS 5.10 Last change: 18 Mar 2004 3
System Administration Commands mount_cachefs(1M)
-O
Overlay mount. Allows the filesystem to be mounted over
an existing mount point, making the underlying filesys-
tem inaccessible. If a mount is attempted on a pre-
existing mount point without setting this flag, mount
will fail with the error:
mount -F cachefs: mount failed Device busy.
EXAMPLES
Example 1: CacheFS-mounting a File System
The following example CacheFS-mounts the file system
server1:/user2, which is already NFS-mounted on /usr/abc as
/xyz.
example# mount -F cachefs -o backfstype=nfs,backpath=/usr/abc,
cachedir=/cache1 server1:/user2 /xyz
The 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
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWcsu |
|_____________________________|_____________________________|
SEE ALSO
cfsadmin(1M), fsck_cachefs(1M), mount(1M), attributes(5)
System Administration Guide: Basic Administration
BUGS
The output for the generic_option -p output is incorrect for
cachefs.
SunOS 5.10 Last change: 18 Mar 2004 4
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This page was generated on Wed Sep 12 11:26:17 GMT 2007
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