NAME
scsictl —
a program to manipulate SCSI
devices and busses
SYNOPSIS
scsictl |
device command
[arg
[...]] |
DESCRIPTION
scsictl allows a user or system administrator to issue
commands to and otherwise control SCSI devices and busses. It is used by
specifying a device or bus to manipulate, the command to perform, and any
arguments the command may require.
scsictl determines if the
specified device is an actual device or a SCSI bus automatically, and selects
the appropriate command set.
For commands which
scsictl issues a SCSI command to the device
directly, any returned sense information will be decoded by
scsictl and displayed to the standard output.
DEVICE COMMANDS
The following commands are supported for SCSI devices:
-
-
- debug
level
- Set the debugging level for the given device; the following
flags are supported:
- 1
- Show scsi commands, errors, data.
- 2
- Routine flow tracking.
- 4
- Internal info from routine flows.
- 8
- Device specific debugging.
This option is only supported with kernels compiled with
SCSIPI_DEBUG
.
-
-
- defects
[primary] [grown]
[block|byte|physical]
- Read the primary and/or grown defect lists from the
specified device in block, byte from index, or physical sector format. The
default is to return both the primary and grown defect lists in physical
sector format. This command is only supported on direct access
devices.
-
-
- format
[blocksize [immediate]]
- (Low level) format the named device. If the optional
blocksize
parameter is provided, the device
geometry will be modified to use the specified
blocksize
. If this parameter is different form the
Current or Default Mode Page 3 parameters, the device will update Mode
Page 3 at the successful completion of the Format. Device geometry may
change as a result of using a new device
blocksize
. When the optional
blocksize
parameter is specified, the Defect List
on the drive will revert to the original primary defect list created at
the time of manufacture if available. The drive will usually recertify
itself during the Format and add any other defective blocks to the new
Defect List. Some disks may not support the ability to change the
blocksize and may enter a Degraded Mode when fed a Format command of this
type. If this happens the standard recovery for the drive requires issuing
a correct Format command, i.e. one without the blocksize parameter.
When the immediate
parameter is also specified, the
disk is instructed to return from the format command right away. It
continues to format, and every ten seconds scsictl
issues a TEST UNIT READY command to check the associated sense data. This
associated sense data has a progress indicator which indicates how far the
format is progressing. Note well that most SCSI disk drives prior to a few
years ago do not support this option.
-
-
- identify
- Identify the specified device, displaying the device's SCSI
bus, target, and lun, as well as the device's vendor, product, and
revision strings.
-
-
- reassign
blkno [blkno
[...]]
- Issues a
REASSIGN BLOCKS
command to
the device, adding the specified blocks to the grown defect list. This
command is only supported on direct access devices.
-
-
- release
- Send a “RELEASE” command to the device to
release a reservation on it.
-
-
- reserve
- Send a “RESERVE” command to the device to place
a reservation on it.
-
-
- reset
- Reset the device. This command is only supported for
devices which support the
SCIOCRESET
ioctl.
-
-
- start
- Send a “START” command to the device. This is
useful typically only for disk devices.
-
-
- stop
- Send a “STOP” command to the device. This is
useful typically only for disk devices.
-
-
- tur
- Send a “TEST UNIT READY” command to the device.
This is useful for generating current device status.
-
-
- getcache
- Returns basic cache parameters for the device.
-
-
- setcache
none|r|w|rw
[save]
- Set basic cache parameters for the device. The cache may be
disabled (none), the read cache enabled (r), the write cache enabled (w),
or both read and write cache enabled (rw). If the drive's cache parameters
are savable, specifying save after the cache enable
state will cause the parameters to be saved in non-volatile storage.
-
-
- flushcache
- Explicitly flushes the write cache.
-
-
- setspeed
speed
- Set the highest speed that the optical drive should use for
reading data. The units are multiples of a single speed CDROM (150 KB/s).
Specify 0 to use the drive's fastest speed.
-
-
- getrealloc
- Returns automatic reallocation parameters for the
device.
-
-
- setrealloc
none|r|w|rw
[save]
- Set automatic reallocation parameters for the device.
Automatic reallocation may be disabled (none), the automatic read
reallocation enabled (r), the automatic write reallocation enabled (w), or
both automatic read and write reallocation enabled (rw). If the drive's
automatic reallocation parameters are savable, specifying
save after the automatic reallocation enable state
will cause the parameters to be saved in non-volatile storage.
BUS COMMANDS
The following commands are supported for SCSI busses:
-
-
- reset
- Reset the SCSI bus. This command is only supported if the
host adapter supports the
SCBUSIORESET
ioctl.
-
-
- scan target
lun
- Scan the SCSI bus for devices. This is useful if a device
was not connected or powered on when the system was booted. The
target and lun arguments
specify which SCSI target and lun on the bus is to be scanned. Either may
be wildcarded by specifying the keyword “any” or
“all”.
-
-
- detach target
lun
- Detach the specified device from the bus. Useful if a
device is powered down after use. The target and
lun arguments have the same meaning as for the
scan command, and may also be wildcarded.
NOTES
When scanning the SCSI bus, information about newly recognized devices is
printed to console. No information is printed for already probed devices.
FILES
/dev/scsibus* - for commands operating on SCSI busses
SEE ALSO
ioctl(2),
cd(4),
ch(4),
scsi(4),
sd(4),
se(4),
ss(4),
st(4),
uk(4),
atactl(8),
dkctl(8)
HISTORY
The
scsictl command first appeared in
NetBSD
1.4.
AUTHORS
The
scsictl command was written by
Jason R.
Thorpe of the Numerical Aerospace Simulation Facility, NASA Ames
Research Center.