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cachefsd(1m) [opensolaris man page]

cachefsd(1M)						  System Administration Commands					      cachefsd(1M)

NAME
cachefsd - CacheFS daemon SYNOPSIS
/usr/lib/fs/cachefs/cachefsd DESCRIPTION
The cachefsd server implements features of the cache filesystem (CacheFS). It is invoked at boot time and run if the / (root) and /usr filesystems are being cached. If /usr is being cached, cachefsd is invoked by inetd(1M) from inetd.conf(4). At run time, cachefsd is invoked by the inetd mechanism in response to an RPC request from a user command such as mount_cachefs(1M). The cachefsd server supports the "disconnected mode" of CacheFS. In this mode, a user can continue to read and, depending on the option selected, write to files in a cached filesystem when the NFS server for the cached files is not available. The cachefsd daemon performs the following functions in support of the CacheFS: o Implements the connection policy. The daemon determines whether the NFS server backing the cache is connected or disconnected from the cache, or is in transition from the connected or disconnected states. o Implements "log rolling," wherein the daemon monitors a disconnected NFS server for reconnection. After such a server returns to a connected state, cachefsd rolls any local changes to cached files (kept in a log) back to the server. o Manages "packing," wherein cachefsd makes a best effort to ensure that files in a user-specified list are available in the cache in disconnected mode. o Supports user interfaces by supplying statistics, reporting conflicts between the cache and the back filesystem, and supporting a list of files for packing. The running of cachefsd is required for the disconnected mode of CacheFS. OPTIONS
The following options are supported: -r Used for invoking cachefsd for the / filesystem. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
cachefspack(1M), cfsadmin(1M), mount_cachefs(1M), inetd.conf(4), attributes(5) SunOS 5.11 2 October 2000 cachefsd(1M)

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mount_cachefs(1M)					  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 information 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 command 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 infor- mation 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 (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 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 consistency 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. -O Overlay mount. Allows the filesystem to be mounted over an existing mount point, making the underlying filesystem 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 attributes: +-----------------------------+-----------------------------+ | 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 18 Mar 2004 mount_cachefs(1M)
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