sg_ses - send controls and fetch status from a SCSI Enclosure Services
sg_ses [--byte1=B1] [--control] [--data=H,H...] [--filter] [--help]
[--hex] [--inner-hex] [--list] [--page=PG] [--raw] [--status]
[--verbose] [--version] DEVICE
Send controls to a SES device (via a SCSI SEND DIAGNOSTIC command) or
fetches status (via a SCSI RECEIVE DIAGNOSTIC RESULTS command). The
DEVICE should be a SES device which may be a dedicated enclosure
services processor (INQUIRY peripheral device type 0xd) or attached to
another type of SCSI device (e.g. a disk) in which case the EncServ bit
set in its INQUIRY response.
If no options are given (only the DEVICE argument) then all diagnostic
pages supported by the device (including SES pages) are listed.
The most recent reference for this utility is the draft SCSI Enclosure
Services 3 document T10/2149-D Revision 2 at http://ww.t10.org .
Existing standards for SES and SES-2 are ANSI INCITS 305-1998 and ANSI
INCITS 448-2008 respectively.
Arguments to long options are mandatory for short options as well. The
options are arranged in alphabetical order based on the long option
some control pages need byte 1 (i.e. the second byte) of the cdb
set. Only required in rare cases when the --control option is
also set. Default is 0; B1 is in decimal unless it is prefixed
by ’0x’ or ’0X’ (or has a trailing ’h’ or ’H’).
will send control information to the DEVICE via a SCSI SEND
DIAGNOSTIC command. Cannot give both this option and --status.
The Enclosure control, String Out, Threshold Out, Array control
(obsolete in SES-2) and Subenclosure String Out diagnostic pages
can be set currently.
permits a string of comma separated (ASCII) hex bytes to be
specified (limit 512). A (single) space separated string of hex
bytes is also allowed but the list needs to be in quotes. This
allows the parameters to a control diagnostic page to be
specified. The string given should not include the first 4 bytes
(i.e. page code and length). See next entry for using stdin.
reads a data string from stdin. Spaces, tabs and line feeds
additionally are permitted as separators.
cuts down on the amount of output from the enclosure status
diagnostic page. When this option is given, any line which has
all its binary flags cleared (i.e. 0) is filtered out (i.e.
ignored). If a line has some other value on it (e.g. a
temperature) then it is output.
output the usage message then exit.
output the response in hexadecimal.
the outer levels of a status diagnostic page are decoded and
printed out but the innermost level (e.g. the element status
descriptor) is output in hex. Implemented for the more complex
list all known diagnostic page names and SES elements. DEVICE is
ignored and utility exits.
where PG is a page code. Assumed to be in decimal unless
prefixed by 0x for hex. Valid range is 0 to 255 (0x0 to 0xff)
inclusive. Default is page_code 0 (i.e. "Supported diagnostic
outputs the chosen status page in (ASCII) hex in a format
suitable for a later invocation using the --data= option. A
status diagnostic page less its first 4 bytes (page code and
length) is output. When used twice (e.g. -rr) outputs full
diagnostic page in binary to stdout.
will fetch status diagnostic page from the DEVICE via a SCSI
RECEIVE DIAGNOSTIC RESULTS command. If this option is not given
and --control is not given then --status is assumed.
increase the level of verbosity, (i.e. debug output).
print the version string and then exit.
Currently all status pages, control pages and element types defined in
SES-2 revision 17 (14th May 2007) are decoded.
This utility can be used to fetch arbitrary (i.e. non SES) diagnostic
pages (using the SCSI READ DIAGNOSTIC command). To this end the
--page=PG and --hex options would be appropriate. Arbitrary diagnostic
pages can be sent to a device with the sg_senddiag utility.
There is a related command set called SAF-TE (SCSI attached
fault-tolerant enclosure) for enclosure (including RAID) status and
control. SCSI devices that support SAF-TE report "Processor" peripheral
device type (0x3) in their INQUIRY response. See the sg_safte utility
in this package or safte-monitor on the internet.
To view the supported pages:
To view the configuration page:
sg_ses --page=1 /dev/sda
To view the status page:
sg_ses --page=2 /dev/sda
Changing a temperature threshold is possible, if a little awkward. The
current thresholds can be shown with:
sg_ses --page=5 /dev/sda
The threshold to be changed can be chosen. Then output the threshold
page in hex (suitable for editing) with:
sg_ses --page=5 --raw /dev/sda > t
Then with the aid of the SES-2 document (in revision 9: section 6.1.8)
use your favourite editor to change t. The change can be sent to the
sg_ses --control --page=5 --data=- /dev/sda < t
If the above is successful, the threshold should have been changed. To
sg_ses --page=5 /dev/sda
The exit status of sg_ses is 0 when it is successful. Otherwise see the
sg3_utils(8) man page.
Written by Douglas Gilbert.
Report bugs to <dgilbert at interlog dot com>.
Copyright © 2004-2010 Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
sg_inq, sg_safte, sg_senddiag (in sg3_utils package); safte-monitor