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+.TH VACFS 4
+.SH NAME
+vacfs \- a Venti-based file system
+.SH SYNOPSIS
+.B vacfs
+[
+.B -dis
+]
+[
+.B -c
+.I cachesize
+]
+[
+.B -h
+.I host
+]
+[
+.B -m
+.I mtpt
+]
+.I vacfile
+.SH DESCRIPTION
+.I Vacfs
+interprets the file system created by
+.IR vac (1)
+so that it can be mounted into a Plan 9 file hierarchy.
+The data for the file system is stored on
+.IR venti (8)
+with a root fingerprint specified in
+.IR vacfile .
+.I Vacfs
+is currently rather limited: access is read-only,
+clients are not authenticated, and groups are assumed to
+contain a single member with the same name.
+These restrictions should eventually be removed.
+.PP
+Options to 
+.I vacfs
+are:
+.TP
+.BI -c " cachesize
+The number of file system blocks to cache in memory. The default is 1000 blocks.
+.TP
+.B -d
+Print debugging information to standard error.
+.TP
+.BI -h " host
+The network address of the Venti server.
+The default is taken from the environment variable
+.BR venti .
+If this variable does not exist, then the default is the
+metaname 
+.BR $venti ,
+which can be configured via
+.IR ndb (6).
+.TP
+.B -i
+Use file descriptors 0 and 1 as the 9P communication channel rather than create a pipe.
+.TP
+.BI -m " mtpt
+The location to mount the file system. The default is
+.BR /n/vac .
+.TP
+.B -s
+Post the 9P channel on #s/vacfs rather than
+mounting it on
+.IR mtpt .
+.SH SOURCE
+.B /sys/src/cmd/vac
+.SH "SEE ALSO"
+.IR vac (1),
+.IR venti (8)