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Introduction
============
The FreeBSD port of sg3_utils contains those utilities that are _not_
specific to Linux. In some cases the FreeBSD camcontrol command supplies
similar functionality; for example 'sg_map' is similar to
'camcontrol devlist'.
The dd variants from the sg3_utils package (e.g. sg_dd) rely on too many
Linux idiosyncracies to be easily ported. A new package called 'ddpt'
contains a utility with similar functionality to sg_dd and ddpt is available
for FreeBSD.
Supported Utilities
===================
Here is a list of utilities that have been ported:
sg_format
sg_get_config
sg_ident
sg_inq [dropped ATA IDENTIFY DEVICE capability]
sg_logs
sg_luns
sg_modes
sg_opcodes
sg_persist
sg_prevent
sg_raw
sg_rdac
sg_read_block_limits
sg_read_buffer
sg_read_long
sg_readcap
sg_reassign
sg_requests
sg_rmsn
sg_rtpg
sg_safte
sg_sat_identify
sg_sat_phy_event
sg_sat_set_features
sg_senddiag
sg_ses
sg_start
sg_stpg
sg_sync
sg_turs
sg_verify
sg_unmap
sg_vpd
sg_wr_mode
sg_write_buffer
sg_write_long
sg_write_same
Most utility names are indicative of the main SCSI command
that they execute. Some utilities are slightly higher level, for
example sg_ses fetches SCSI Enclosure Services (SES) status pages and
can send control pages. Each utility has a man page (placed in
section 8). An overview of sg3_utils can be found at:
http://sg.danny.cz/sg/sg3_utils.html .
A copy of the "sg3_utils.html" file is in the "doc" subdirectory.
See the INSTALL file (at the end) for instructions on how to build
sg3_utils on FreeBSD. If the "./configure ; make" sequence fails, try
running "./autogen.sh" first. Some man pages have examples which use
linux device names which hopefully will not confuse the FreeBSD users.
Details
=======
The ported utilities listed above, all use SCSI command functions
declared in sg_cmds_basic.h and sg_cmds_extra.h . Those SCSI command
functions are implemented in the corresponding ".c" files. The ".c"
files pass SCSI commands to the host operating system via
an interface declared in sg_pt.h . There are currently four
implementations of that interface depending on the host operating
system:
- sg_pt_linux.c
- sg_pt_freebsd.c
- sg_pt_osf1.c [Tru64]
- sg_pt_win32.c
The sg_pt_freebsd.c file uses the FreeBSD CAM SCSI pass through
mechanism. Hence only FreeBSD device nodes that support CAM can
be used. These can be viewed with the "camcontrol devlist"
command. To access ATAPI devices (e.g. ATAPI DVD drives) the
kernel may need to be configured with the "atapicam" device.
Disks is FreeBSD have names like '/dev/da0' while the corresponding
pass-through device may be '/dev/pass0'.
At the present time these utilities have been lightly tested on a
FreeBSD version 7.0 system with some SCSI disks, a SCSI tape
drive and an ATAPI CD drive.
See the FreeBSD section in the INSTALL file for install directions.
Doug Gilbert
15th June 2009
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