170 lines
3.1 KiB
Text
170 lines
3.1 KiB
Text
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.TH BACKUP 8
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.SH NAME
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backup, tobackup, dumparenas, restore \- backup venti arenas to blu-ray discs or restore from them
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.SH SYNOPSIS
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.B backup
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[
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.B -n
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] [
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.B -d
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.I dev
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] [
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.B -s
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.I set
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]
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.br
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.B tobackup
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[
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.I set
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]
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.br
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.B dumparenas
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.I dev
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.I arena
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\&...
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.br
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.B restore
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.I arena-#
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[
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.I dev
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]
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.SH DESCRIPTION
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These programs reside in
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.B /sys/lib/backup
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and provide a means to backup
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.IR venti (8)
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storage to Blu-ray (or other large optical) discs,
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while keeping track of which arenas have been written to which discs.
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Multiple backup sets are supported,
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as is (re)loading a
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.I venti
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store from a backup thus made.
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.PP
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The first time that
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.I backup
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is run,
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it will dump all sealed
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.I venti
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arenas.
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Thereafter,
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it will append only those sealed arenas not already written to a disc
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within the given backup set.
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The
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.B -s
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option uses a backup
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.I set
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other than the default.
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The
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.B -d
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option uses a disc burner
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other than the default
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.LR /dev/sdD0 .
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The
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.B -n
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option goes through the motions but does not burn any tracks
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on the Blu-ray disc.
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.PP
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.I Tobackup
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prints the names of all the sealed arenas not yet backed up to a disc
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in the current
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.IR set .
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.PP
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.I Dumparenas
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copies the named
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.IR arena s,
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one per track,
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to the device
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.IR dev ,
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which is first mounted via
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.IR cdfs (4).
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.I Venti/rdarena
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is used to extract each arena.
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.PP
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.I Tobackup
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and
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.I dumparenas
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are invoked internally by
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.IR backup .
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.PP
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.I Restore
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copies each data track (assumed to be a saved arena) on
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.I dev
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(by default,
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.LR /dev/sdC0 )
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into its appropriate place in the
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.I venti
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arenas partition
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(locally,
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.BR /dev/sde0/arenas ),
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thus adding the arena to the current
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.I venti
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store.
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The arena size of the arena partition must match the size of the arenas
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on optical disc (except for ~60K of trailing debris on the optical disc arenas).
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.PP
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.I Arena-#
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must be the number (starting from zero)
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of the first arena slot in the arenas partition that
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you wish to restore into from the current optical disc
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.RI ( not
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necessarily that of the first arena on the disc).
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.I Restore
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will prompt for confirmation that the first arena is the correct one,
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after printing a summary of its arena header.
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Typing
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.L y
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will proceed normally,
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.L n
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will abort all processing,
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and
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.L skip
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will cause
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.I restore
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to proceed to the next track and ask for confirmation of it.
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.PP
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The arenas partition must be formatted
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(see
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.I fmtarenas
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in
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.IR venti-fmt (8))
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before restoring into it.
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When all the arenas have been restored,
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it will be necessary to build a new
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.I venti
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index,
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the usual steps being to run
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.IR checkarenas ,
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.IR fmtisect ,
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.IR fmtbloom ,
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.IR fmtindex ,
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and
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.IR "buildindex -b" ,
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all from
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.IR venti-fmt (8).
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.SH FILES
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.TF /sys/lib/backup
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.TP
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.B /sys/lib/backup
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backup scripts and records
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.TP
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.B set1
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subdirectory containing records for default backup set
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.TP
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.B /sys/log
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source of dump scores
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.SH SOURCE
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.B /sys/lib/backup
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.SH SEE ALSO
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.IR venti (1),
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.IR cdfs (4),
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.IR venti (8),
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.IR venti-fmt (8),
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.IR venti-backup (8)
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.br
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.IR "Venti Backup on Blu-Ray Discs"
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.SH BUGS
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Assumes a single arenas partition named
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.LR arena0 .
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Assumes that the file server's arenas are accessible on it as
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.LR /dev/fs/arena0 .
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