HP-UX Reference (11i v2 07/12) - 1M System Administration Commands N-Z (vol 4)

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st(1M) st(1M)

NAME

st - shared tape administration

SYNOPSIS

st -f device_ﬁle [-r][

-s]

DESCRIPTION

The

st command provides users with a command-line interface to check the status of a shared tape device

or to reclaim a shared tape device from a host system that has failed while holding a reservation on the

shared tape device. The st command can also be used for the same purpose on shared library robotic dev-

ices. To use the st command you must have root user id.

Please see examples below for usage.

Options

st recognizes the following options and arguments:

-f device_file Speciﬁes the tape device ﬁle or sctl pass-through device ﬁle for the shared tape/library dev-

ice. This parameter is mandatory and st will report an error if -f device_ﬁle is omitted.

-r Allows the user to reclaim a shared tape device or shared library robotic device in the case

where a host failed while holding a reservation on the shared device. This option causes a

bus device reset to be issued to the device speciﬁed by the -f option.

-s Prints out the current status of the shared tape/library device speciﬁed by the

-f option.

RETURN VALUE

st returns 0 upon successful completion and 1 otherwise.

EXAMPLES

st -f /dev/scsi/st_device -s

The following shows three examples of output from the above command.

Device is reserved by another host

The above output indicates that the shared device is reserved by another host and is therefore unavailable

at this time.

Device not ready

The above output indicates that the shared device is not ready for use at this time.

Device is OK and available

The above output indicates that the shared device is ready for use at this time.

To reclaim a shared tape/library device from a failed host, the following command can be used:

st -f /dev/scsi/st_device -r

WARNINGS

The -r option must be used with care. When reclaiming devices, it must be ensured that the host from

which the device is being reclaimed has in fact failed, as data may be lost as the result of reclaiming a dev-

ice that is currently in use by another host.

DEPENDENCIES

The sctl SCSI pass-through driver must be conﬁgured in the kernel before this command can be used to

administer the shared tape device. See scsi_ctl(7).

AUTHOR

st was developed by Hewlett-Packard.