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SCSICTL(8)                BSD System Manager's Manual               SCSICTL(8)

     scsictl -- a program to manipulate SCSI devices and busses

     scsictl device command [arg [...]]

     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.

     The following commands are supported for SCSI 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 suc-
     cessful 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 indica-
     tor 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


     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.


     Send a ``RELEASE'' command to the device to release a reservation on it.


     Send a ``RESERVE'' command to the device to place a reservation on it.


     Reset the device.  This command is only supported for devices which sup-
     port the SCIOCRESET ioctl.


     Send a ``START'' command to the device.  This is useful typically only
     for disk devices.


     Send a ``STOP'' command to the device.  This is useful typically only for
     disk devices.


     Send a ``TEST UNIT READY'' command to the device.  This is useful for
     generating current device status.


     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.


     Explicitly flushes the write cache.

     The following commands are supported for SCSI busses:


     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 con-
     nected 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.

     When scanning the SCSI bus, information about newly recognized devices is
     printed to console.  No information is printed for already probed

     /dev/scsibus* - for commands operating on SCSI busses

     ioctl(2), cd(4), ch(4), sd(4), se(4), ss(4), st(4), uk(4)

     The scsictl command first appeared in NetBSD 1.4.

     The scsictl command was written by Jason R. Thorpe of the Numerical Aero-
     space Simulation Facility, NASA Ames Research Center.

BSD                            September 1, 2003                           BSD