term% cat index.txt BACKUP(8) System Manager's Manual BACKUP(8)
NAME
backup, tobackup, dumparenas, restore - backup venti arenas to blu-ray
discs or restore from them
SYNOPSIS
backup [ -np ] [ -d dev ] [ -s set ]
tobackup [ set ]
dumparenas dev arena ...
restore arena-# [ dev ]
DESCRIPTION
These programs reside in /sys/lib/backup and provide a means to backup
venti(8) storage to Blu-ray (or other large optical) discs, while keep‐
ing track of which arenas have been written to which discs. Multiple
backup sets are supported, as is (re)loading a venti store from a
backup thus made.
The first time that backup is run, it will dump all sealed venti are‐
nas. Thereafter, it will append only those sealed arenas not already
written to a disc within the given backup set. The -s option uses a
backup set other than the default. The -d option uses a disc burner
other than the default The -n option goes through the motions but does
not burn any tracks on the Blu-ray disc. As a side-effect, backup run
on the default dump set, will also print the last few fossil dump
scores unless the -p option is given.
Tobackup prints the names of all the sealed arenas not yet backed up to
a disc in the current set.
Dumparenas copies the named arenas, one per track, to the device dev,
which is first mounted via cdfs(4). Venti/rdarena is used to extract
each arena.
Tobackup and dumparenas are invoked internally by backup.
Restore copies each data track (assumed to be a saved arena) on dev (by
default, into its appropriate place in the venti arenas partition (lo‐
cally, /dev/sde0/arenas), thus adding the arena to the current venti
store. The arena size of the arena partition must match the size of
the arenas on optical disc (except for ~60K of trailing debris on the
optical disc arenas).
Arena-# must be the number (starting from zero) of the first arena slot
in the arenas partition that you wish to restore into from the current
optical disc (not necessarily that of the first arena on the disc).
Restore will prompt for confirmation that the first arena is the cor‐
rect one, after printing a summary of its arena header. Typing will
proceed normally, will abort all processing, and will cause restore to
proceed to the next track and ask for confirmation of it.
The arenas partition must be formatted (see fmtarenas in venti-fmt(8))
before restoring into it. When all the arenas have been restored, it
will be necessary to build a new venti index, the usual steps being to
run checkarenas, fmtisect, fmtbloom, fmtindex, and buildindex -b, all
from venti-fmt(8).
FILES
/sys/lib/backup
backup scripts and records
set1 subdirectory containing records for default backup set
/sys/log
source of dump scores
SOURCE
/sys/lib/backup
SEE ALSO
venti(1), cdfs(4), venti(8), venti-fmt(8), venti-backup(8)
Venti Backup on Blu-Ray Discs
BUGS
Assumes a single arenas partition named Assumes that the file server's
arenas are accessible on it as
BACKUP(8)