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na_tape - Information on the tape interface
The Data ONTAP system supports up to 64 local tape drives
(tape drives connected directly to the system). The tape
drive interface follows a UNIX-like device name allowing
use of a rewind, norewind or unload/reload device. The
device name can be the classic cstnd format, or of the
format c.name.d where:
- c
- describes the rewind/unload characteristic of the
device. Use r to specify the rewind device, use nr
to specify the norewind device, or use ur to specify
the unload/reload device. The norewind device
will not rewind when the tape device is closed.
The unload/reload device is used with sequential
tape loaders and will unload the current tape volume
and attempt to load the next tape volume (note
that the server will wait up to one minute for the
next volume to become ready before aborting the
reload of the next volume). The rewind device will
rewind the tape volume to beginning-of-tape on
close.
- st
- the st portion of the device name is always present
in the classic format, and is one of the
options in the name format. It specifies that you
are requesting a SCSI tape device.
- n
- the alias number (in decimal) of the tape drive to
use. The st and n parameters together - stn constitute
a tape "alias". See the storage alias
command for information about tape aliases and
device addresses.
- d
- the density (or format) to use for tape write
operations. Consists of one of the four letters l
(low), m (medium), h (high) or a (advanced).
- name
- specifies a tape alias, an electrical name or a
serial number(SN) corresponding to the tape
device. The electrical name and SN formats can
contain an optional parameter for the device SCSI
logical unit. This parameter is expressed as Llun.
See the storage alias command for further information
about the format of the name parameter.
Each tape device is automatically associated with an
alias. If an alias assignment does not already exist at
the first discovery of a tape device, the system will create
an alias for it. FC and SAS devices receive SN
aliases, and SCSI devices receive electrical aliases by
default. The alias will remain associated with the SN or
electrical name -- even through boot -- until the alias is
changed.
The storage alias and storage unalias commands allow the
user to view existing aliases and delete aliases
respectively. The storage alias command also allows the
user to change an existing alias name or to assign the
alias prior to a tape device being discovered. You can
assign the tape alias by specifying the alias name with
the electrical name or serial number with the storage
alias command.
The density specifications for an Exabyte 8505 8mm drive:
l Exabyte 8200 format, no compression
m Exabyte 8200 format with compression
h Exabyte 8500 format, no compression
a Exabyte 8500 format with compression
Examples of tape drive names:
nrst0l
nr.st0.l
r.9a.1L1.a
ur.switch1:5.h
nr.SN[HU104514FJ].m
The sysconfig -t command displays the tape drives on your
system, the device alias associated with each tape device,
and the device's available density settings. The following
is an example of the output from a sysconfig command
on a system with one tape device attached:
toaster> sysconfig -t
Tape drive (0.6) Exabyte 8505 8mm
rst0l - rewind device, format is: EXB-8200 2.5GB
nrst0l - no rewind device, format is: EXB-8200 2.5GB
urst0l - unload/reload device, format is: EXB-8200 2.5GB
rst0m - rewind device, format is: EXB-8200C (w/compression)
nrst0m - no rewind device, format is: EXB-8200C (w/compression)
urst0m - unload/reload device, format is: EXB-8200C (w/compression)
rst0h - rewind device, format is: EXB-8500 5.0GB
nrst0h - no rewind device, format is: EXB-8500 5.0GB
urst0h - unload/reload device, format is: EXB-8500 5.0GB
rst0a - rewind device, format is: EXB-8500C (w/compression)
nrst0a - no rewind device, format is: EXB-8500C (w/compression)
urst0a - unload/reload device, format is: EXB-8500C (w/compression)
The storage show tape command shows the electrical
name, WWN and serial number associated with the
device and the corresponding alias:
toaster> storage show tape
Tape Drive: 0.6
Description: Exabyte 8505 8mm
Serial Number: IE71E024
World Wide Name:
Alias Name(s): st0
Device State: available
na_dump(1), na_mt(1), na_storage(1), na_sysconfig(1)
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