tadd - plan9port - [fork] Plan 9 from user space
(HTM) git clone git://src.adamsgaard.dk/plan9port
(DIR) Log
(DIR) Files
(DIR) Refs
(DIR) README
(DIR) LICENSE
---
(DIR) commit 35ed6913ebd469a0e11458a31eaa78204e9e135c
(DIR) parent cbf81cb09d586d3ca278dca9bae6df0661dad3b3
(HTM) Author: rsc <devnull@localhost>
Date: Wed, 13 Jul 2005 14:06:07 +0000
add
Diffstat:
A man/man8/vbackup.8 | 263 +++++++++++++++++++++++++++++++
1 file changed, 263 insertions(+), 0 deletions(-)
---
(DIR) diff --git a/man/man8/vbackup.8 b/man/man8/vbackup.8
t@@ -0,0 +1,263 @@
+.TH VBACKUP 8
+.SH NAME
+vbackup, vcat, vftp, vmount, vmount0, vnfs \-
+back up Unix file systems to Venti
+.SH SYNOPSIS
+.B vbackup
+[
+.B -DVnv
+]
+[
+.B -s
+.I secs
+]
+[
+.B -w
+.I n
+]
+.I disk
+[
+.I score
+]
+.PP
+.B vcat
+[
+.B -z
+]
+.I disk
+|
+.I score
+.B >
+.I disk
+.PP
+.B vftp
+.I disk
+|
+.I score
+.PP
+.B vmount
+[
+.B -v
+]
+.I addr
+.I mtpt
+.PP
+.B vmount0
+[
+.B -v
+]
+[
+.B -h
+.I handle
+]
+.I addr
+.I mtpt
+.PP
+.B vnfs
+[
+.B -LLMRVr
+]
+[
+.B -a
+.I addr
+]
+[
+.B -m
+.I mntaddr
+]
+[
+.B -b
+.I blocksize
+]
+[
+.B -c
+.I cachesize
+]
+.I config
+.SH DESCRIPTION
+These programs back up and restore standard
+Unix file system images stored in
+.IR venti (8).
+Images stored in
+.I venti
+are named by
+.IR scores ,
+which consist of a file system type followed
+by a colon and forty hexadecimal digits, as in:
+.IP
+.EX
+ffs:0123456789abcdef0123456789abcdef01234567
+.EE
+.PP
+(The hexadecimal data is the SHA1 hash of the Venti
+root block representing the file system image.)
+.PP
+These programs expect the environment variable
+.B $venti
+to be set to the network address of the Venti server to use
+(for example,
+.B yourhost
+or
+.BR tcp!yourhost!venti ).
+.PP
+.I Vbackup
+copies the file system stored on
+.I disk
+to the Venti server and prints the
+score for the newly-stored image.
+The argument
+.I disk
+should be a disk or disk partition device
+that would be appropriate to pass to
+.IR mount (8).
+.PP
+The optional argument
+.I score
+is the score of a previous backup of the disk image.
+If
+.I score
+is given,
+.I vbackup
+will not write to Venti any blocks that have not changed
+since the previous backup.
+This is only a speed optimization: since the blocks are already
+stored on Venti they need not be sent to the Venti server again.
+.PP
+The options to
+.I vbackup
+are:
+.TP
+.B -D
+.TP
+.B -V
+.TP
+.B -n
+.TP
+.B -v
+.TP
+.B -w \fIn
+.TP
+.B -s \fIsecs
+.PP
+.I Vcat
+writes the named disk image to standard output.
+Unused file system blocks are printed zeroed regardless
+of their actual content.
+.PP
+If the
+.B -z
+flag is given,
+.I vcat
+will attempt to seek over unused blocks instead of writing to them.
+The
+.B -z
+flag should only be used when standard output is seekable
+.RI ( i.e. ,
+when it has been redirected to a file or disk).
+.PP
+.I Vftp
+presents the
+file system image named by
+.I disk
+or
+.I score
+in a shell-like
+interactive session.
+Type
+.B help
+at the
+.B vftp>
+prompt for details.
+.PP
+.I Vmount
+mounts the NFS service at the network connection
+.I address
+onto
+.IR mountpoint .
+On most operating systems,
+.I vmount
+must be run by the user
+.BR root .
+.PP
+.I Vmount0
+is a simple C program that
+.I vmount
+uses if
+.IR mount (8)
+does not suffice.
+.PP
+.I Vnfs
+serves, using the
+NFS version 3 protocol,
+one or more disk images in a synthetic tree defined
+by the configuration file
+.IR config .
+.I Vnfs
+announces NFS service at
+.IR addr
+(default
+.BR udp!*!nfs )
+and NFS mount service at
+.IR mntaddr
+(default
+.BR udp!*!\fI999 ),
+registering both with the port mapper.
+If no port mapper is found running (on port 111),
+.I vnfs
+starts its own port mapper.
+The options are:
+.TP
+.B -r
+Reply to all NFS requests with RPC rejections.
+.TP
+.B -M
+Do not announce an NFS mount service.
+.TP
+.B -P
+Do not register service with the port mapper.
+.TP
+.B -a
+
+
+.SH EXAMPLES
+.PP
+Back up the file system stored on
+.BR /dev/da0s1a :
+.IP
+.EX
+% vbackup /dev/da0s1a
+ffs:0123456789abcdef0123456789abcdef01234567
+%
+.EE
+.PP
+Serve that backup and a few others in a tree reminiscent
+of Plan 9's dump file system, but hide each day's contents of
+.B /tmp :
+.IP
+.EX
+% cat config
+mount /2005/0510 ffs:0123456789abcdef\fI...\fP
+mount /2005/0510/home ffs:0123456789abcdef\fI...\fP
+mount /2005/0510 ffs:0123456789abcdef\fI...\fP
+mount /2005/0510/home ffs:0123456789abcdef\fI...\fP
+hide /*/*/tmp
+% vnfs -m -b 16k -c 1k config
+%
+.EE
+.PP
+Mount the backups on a client machine using
+.IR vmount :
+.IP
+.EX
+# vmount udp!yourserver!nfs /dump
+# ls /dump
+2005
+#
+.EE
+.PP
+Mount the backups using the standard NFS mount program:
+.IP
+.EX
+# mount -t nfs -o soft,intr,ro,nfsv3,rsize=8192,timeo=100 \
+ -o nfsvers=3,nolock,noatime,nodev,nosuid \
+.EE