On Sat, Dec 01, 2001 at 02:46:42PM +1100, Jason Thomas wrote:
> On Fri, Nov 30, 2001 at 04:51:20PM -0500, Jean-Louis Martineau wrote:
> > * tapeio.
>
> could someone provide a summary of what tapeio is/provides/fixes?
Look at the "OUTPUT DRIVERS" section of the amanda man page.
Jean-Louis
--
Jean-Louis Martineau email: [EMAIL PROTECTED]
Departement IRO, Universite de Montreal
C.P. 6128, Succ. CENTRE-VILLE Tel: (514) 343-6111 ext. 3529
Montreal, Canada, H3C 3J7 Fax: (514) 343-5834
OUTPUT DRIVERS
The normal value for the tapedev parameter, or for what a
tape changer returns, is a full path name to a non-rewind�
ing tape device, such as /dev/nst0 or /dev/rmt/0mn or
/dev/nst0.1 or whatever conventions the operating system
uses. Amanda provides additional application level
drivers that support non-tradition tape simulatation or
features. To access a specific output driver, set tapedev
(or configure your changer to return) a string of the form
driver:driver-info where driver is one of the supported
drivers and driver-info is optional additional information
needed by the driver.
The supported drivers are:
tape This is the default driver. The driver-info is
the tape device name. Entering /dev/rmt/0mn is
really a short hand for tape:/dev/rmt/0mn.
null This driver throws away anything written to it
and returns EOF for any reads except a special
case is made for reading a label, in which case
a "fake" value is returned that Amanda checks
for and allows through regardless of what you
have set in labelstr. The driver-info field is
not used and may be left blank:
tapedev "null:"
The length value from the associated tapetype is
used to limit the amount of data written. When
the limit is reached, the driver will simulate
end of tape.
NOTE: this driver should only be used for debug�
ging and testing, and probably only with the
record option set to no.
rait Redundant Array of Inexpensive (?) Tapes.
Reads and writes tapes mounted on multiple
drives by spreading the data across N-1 drives
and using the last drive for a checksum. See
docs/RAIT for more information.
The driver-info field describes the devices to
use. Curly braces indicate multiple replace�
ments in the string. For instance:
tapedev "rait:/dev/rmt/tps0d{4,5,6}n"
would use the following devices:
/dev/rmt/tps0d4n
/dev/rmt/tps0d5n
/dev/rmt/tps0d6n
file This driver emulates a tape device with a set of
files in a directory. The driver-info field
must be the name of an existing directory. The
driver will test for a subdirectory of that
named data and return offline until it is pre�
sent. When present, the driver uses two files
in the data subdirectory for each tape file.
One contains the actual data. The other con�
tains record length information.
The driver uses a file named status in the file
device directory to hold driver status informa�
tion, such as tape position. If not present,
the driver will create it as though the device
is rewound.
The length value from the associated tapetype is
used to limit the amount of data written. When
the limit is reached, the driver will simulate
end of tape.
One way to use this driver with a real device
such as a CD is to create a directory for the
file device and one or more other directories
for the actual data. Create a symlink named
data in the file directory to one of the data
directories. Set the tapetype length to what�
ever the medium will hold.
When Amanda fills the file device, remove the
symlink and (optionally) create a new symlink to
another data area. Use a CD writer software
package to burn the image from the first data
area.
To read the CD, mount it and create the data
symlink in the file device directory.
