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SG_RESET(8) SG3_UTILS SG_RESET(8)
NAME
sg_reset - sends SCSI device, bus or host reset; or checks reset state
SYNOPSIS
sg_reset [-b] [-d] [-h] [-V] DEVICE
DESCRIPTION
The sg_reset utility with no options (other than DEVICE) reports on the reset state (e.g. if a reset is underway) of DEVICE. When given a
-d, -b, or -h option it requests a device, bus or host reset respectively.
In the linux kernel 2.6 series this utility can be called on sd, sr (cd/dvd), st or sg device nodes; if the user has appropriate permis-
sions.
In the linux kernel 2.4 series support for this utility first appeared in lk 2.4.19 and could only be called on sg device nodes. Various
vendors made this capability available in their kernels prior to lk 2.4.19.
OPTIONS
-b attempt a SCSI bus reset. This would normally be tried if the device reset (i.e. option -d) was not successful.
-d attempt a SCSI device reset. If the device seems stuck, this is the first reset that should be tried. This assumes the linux scsi
mid level error handler is not already in the process of resetting DEVICE.
-h attempt a host adapter reset. This would normally be tried if both device reset (i.e. option -d) and bus reset (i.e. option -b) were
not successful.
-V prints the version string then exits.
NOTES
The error recovery code within the linux kernel when faced with SCSI commands timing out and no response from the device (LU), first tries
a device reset and if that is not successful tries a bus reset. If that is not successful it tries a host reset. Users of this utility
should check whether such a recovery is already underway before trying to reset with this utility. The "device,bus,host" order is also rec-
ommended (i.e. first start with the smallest hammer).
SAM-4 defines a hard reset (which includes a device power on and a transport reset), a logical unit reset and a I_T nexus reset. A LU reset
and an I_T nexus reset can be requested via task management function (and support for LU reset is mandatory). In Linux the SCSI subsystem
leaves it up to the low level drivers as to whether a "device reset" is only for the addressed LU or all the LUs in the device that con-
tains the addressed LU. The "bus reset" is a transport reset. A "host reset" attempts to re-initialize the HBA that the request passes
through on route to the DEVICE. Obviously a "host reset" and a "bus reset" can cause collateral damage.
This utility does not allow individual SCSI commands (or tasks as they are called in SAM-4) to be aborted. SAM-4 defines ABORT TASK and
ABORT TASK SET task management functions for that.
AUTHORS
Written by Douglas Gilbert.
COPYRIGHT
Copyright (C) 1999-2006 Douglas Gilbert
This software is distributed under the GPL version 2. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-
POSE.
sg3_utils-1.23 December 2006 SG_RESET(8)