SCHEDULE(ADM) XENIX System V SCHEDULE(ADM)
Name
schedule - Database for automated system backups.
Description
The schedule database is used in conjunction with
fsphoto(ADM) to partially automate system-wide backups. For
each filesystem to be backed-up, a cyclical schedule of
backup(ADM) levels is specified.
This cyclical schedule (or cycle) is a list of backup levels
to perform (including no backup at all) and a pointer to the
last-used element of that list. The pointer is advanced to
the next element of the list on a regular basis (each time
fsphoto is run, usually once per day), starting over at the
beginning each time it falls off the end. It is advanced,
however, only on success - the desired backup must have been
successful.
Each entry in the file is on a separate line. Blank and
comment lines (beginning with ``#'') may be placed anywhere.
Several keywords are recognized:
site sitename
Sitename is passed to fsave as a description to place
on each tape label. Usually, sitename is the name of
the company or a building number.
media drive k sizes... [format]
Device drive is a floppy capable of handling volumes
with any of the listed sizes (in kilobytes). If
specified, format is the command used to format the
described floppies. This also applies to standard
cartridge tapes.
media drive d density sizes... [format]
Device drive is a density BPI magtape capable of
handling tapes of any of the indicated sizes (in feet).
Like floppies, format is the optional command used to
format the described tape.
[0-9] size savetime importance marker
Description of each backup level, as described in
fsave(ADM). The defaults are:
Level Size Savetime Importance Marker
0 - "1 year" critical none
1 - "3 months" necessary none
2...7 - "1 month" important none
8 - "2 weeks" useful none
9 - "1 week" precautionary none
All four fields must be specified. A size of - means to use
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SCHEDULE(ADM) XENIX System V SCHEDULE(ADM)
the first size listed in the appropriate media sizes list.
Keywords should be placed before any filesystem backup
schedules. A filesystem backup schedule is of the form:
/dev/rfilesys cycle
The filesystem resident on device /dev/rfilesys is to
be backed-up according to cycle, which is a space-
separated list of backup levels (the digits 0 to 9,
passed to backup), or the letter x, meaning no backup
should occur. The specified device should be the raw
(character) device associated with the filesystem.
A backup cycle must have at least one member, but it may be
of any length. Different filesystems may have cycles of
different lengths.
Here is the default schedule file:
# SYSTEM BACKUP SCHEDULE
site mymachine
# Media Entries
#
# 96 tpi 1.2 MB floppy 0
# media /dev/rfd096ds15 k 1200 format /dev/rfd096ds15
# 96 tpi 1.2 MB floppy 1
# media /dev/rfd196ds15 k 1200 format /dev/rfd196ds15
# 135 tpi 1.44 MB floppy 0
# media /dev/rfd0135ds18 k 1440 format /dev/rfd0135ds18
# 135 tpi 1.44 MB floppy 1
# media /dev/rfd1135ds18 k 1440 format /dev/rfd1135ds18
# Cartridge tape 1
media /dev/rct0 k 60000 125000 150000 tape erase
# Mini cartridge drive (10MB)
# media /dev/rctmini k 8800 format /dev/rctmini
# Mini cartridge drive (20MB)
# media /dev/rctmini k 17200 format /dev/rctmini
# Mini cartridge drive (40MB)
# media /dev/rctmini k 37500 format /dev/rctmini
# 9-track tape drive
# media /dev/rmt0 d 1600 2400 1200 600
# Backup Descriptor Table
# Backup Vol. Save for Vitality Label
# level size how long (importance) marker
0 - "1 year" critical "a red sticker"
1 - "4 months" necessary "a yellow sticker"
2 - "3 weeks" useful "a blue sticker"
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3 - "1 week" precautionary none
# Schedule Table
# 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
# Filesystem M T W T F M T W T F M T W T F M T W T F
/dev/rroot 0 x 3 x 3 2 x 3 x 3 1 x 3 x 3 2 x 3 x 3
/dev/ru 3 0 3 3 3 3 2 3 3 3 3 1 3 3 3 3 2 3 3 3
/dev/rroot is backed-up using a level 0 backup the first
time fsphoto is run (on a Monday), and if that backup is
successful, the next (second) time it runs (Tuesday), no
backup is performed. If doing nothing is successful, the
third time (Wednesday) a level 3 backup occurs. If that
backup succeeds, no backup occurs the fourth time
(Thursday), but the fifth time fsphoto is run (Friday), a
level 3 backup is made.
Each time a successful backup at the specified level
happens, the pointer advances so that the next run of
fsphoto (on the next weekday) will do the next backup
scheduled for that filesystem. If however, a backup fails
(or is interrupted or postponed by the operator) the pointer
is not advanced; hence, the next time fsphoto is attempted,
the same level backup will again be tried so the sequence
will not be broken (but the timing may be off).
The larger and more rapidly changing filesystem /dev/ru is
backed-up more frequently (each time fsphoto is run - once a
day - instead of every other time), and the levels used are
staggered to prevent having to perform two full-scale
backups (like levels 0 or 1) of the large filesystems on the
same day. The backup cycle period is also shorter, two
weeks instead of four.
See Also
fsphoto(ADM), fsave(ADM), backup(ADM)
Notes
Keywords and filesystem names must not be preceded by any
spaces or tabs.
It is not necessary to specify the name of the ``raw''
(/dev/r*) device for each filesystem, but the backups are
faster if this is done.
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