.Op Fl T Ar date

.Op Fl T Ar date

.Ar filesystem

.Ar filesystem

.Nm

.Nm

.Pp

.Pp

.in \" XXX

.in \" XXX

(The

(The

(such as some cartridge tape drives)

(such as some cartridge tape drives)

each volume is of a fixed size;

each volume is of a fixed size;

the actual size is determined by the tape size and density and/or

the actual size is determined by the tape size and density and/or

By default, the same output file name is used for each volume

By default, the same output file name is used for each volume

after prompting the operator to change media.

after prompting the operator to change media.

.Pp

.Pp

The following options are supported by

The following options are supported by

.Nm :

.Nm :

.Bl -tag -width Ds

.Bl -tag -width Ds

.It Fl 0\-9

.It Fl 0\-9

Dump levels.

Dump levels.

A level 0, full backup,

A level 0, full backup,

(but see also the

(but see also the

.Fl h

.Fl h

option below).

option below).

drive with hardware compression (where you can never be sure about

drive with hardware compression (where you can never be sure about

the compression ratio).

the compression ratio).

.It Fl B Ar records

.It Fl B Ar records

This option overrides the calculation of tape size

This option overrides the calculation of tape size

based on length and density.

based on length and density.

.It Fl b Ar blocksize

.It Fl b Ar blocksize

.It Fl c

.It Fl c

Change the defaults for use with a cartridge tape drive, with a density

Change the defaults for use with a cartridge tape drive, with a density

of 8000 bpi, and a length of 1700 feet.

of 8000 bpi, and a length of 1700 feet.

option may be used to change it.

option may be used to change it.

.It Fl W

.It Fl W

.Nm Dump

.Nm Dump

This information is gleaned from the files

This information is gleaned from the files

.Pa dumpdates

.Pa dumpdates

and

and

.Fl W

.Fl W

option causes

option causes

.Nm

.Nm

the

the

.Pa dumpdates

.Pa dumpdates

file

file

the most recent dump date and level,

the most recent dump date and level,

If the

If the

.Fl W

.Fl W

option is set, all other options are ignored, and

option is set, all other options are ignored, and

This should be done at set intervals, say once a month or once every two months,

This should be done at set intervals, say once a month or once every two months,

and on a set of fresh tapes that is saved forever.

and on a set of fresh tapes that is saved forever.

.It

.It

using a modified Tower of Hanoi algorithm,

using a modified Tower of Hanoi algorithm,

with this sequence of dump levels:

with this sequence of dump levels:

.Bd -literal -offset indent

.Bd -literal -offset indent

for each day, used on a weekly basis.

for each day, used on a weekly basis.

Each week, a level 1 dump is taken, and

Each week, a level 1 dump is taken, and

the daily Hanoi sequence repeats beginning with 3.

the daily Hanoi sequence repeats beginning with 3.

used, also on a cyclical basis.

used, also on a cyclical basis.

.El

.El

.Pp

.Pp

.Fl D

.Fl D

option)

option)

.It Pa /etc/fstab

.It Pa /etc/fstab

.It Pa /etc/group

.It Pa /etc/group

to find group

to find group

.Em operator

.Em operator

Currently,

Currently,

.Xr physio 9

.Xr physio 9

slices all requests into chunks of 64 KB.  Therefore, it is

slices all requests into chunks of 64 KB.  Therefore, it is

.Nm

.Nm

will prevent this from happening.

will prevent this from happening.

.Pp

.Pp