scsiinfo - query information from a scsi device
scsiinfo [-options...] [device]
scsiinfo queries information from an scsi target. This means generally
using the INQUIRY scsi command or reading out SCSI-II mode pages (the
number of the mode pages and corresponding sections of the SCSI-II
sections is given below). It allows also to modify some of these
settings on the scsi device (if it supports it).
Except for the -v and -l options you must specify exactly one scsi
device to work on. You may specify any linux scsi device disk, tape,
cdrom, generic scsi.
Some scsi devices (typically non removable disks) will allow to store
your modifications in some non volatile memory. Some of these settings
(for example those dealing with the layout of logical blocks and
sectors set aside as replacements for erroneous blocks) might render
the disk unusable until a low level format.
Information available from most SCSI devices (includes SCSI-I)
-i display all information from the INQUIRY scsi command.
-s displays the unit serial number using the INQUIRY scsi command.
-d display factory and grown defect lists (typically for disks
It is currently only possible to return defect information up to
4096 bytes. Longer defect lists are truncated. See the BUGS
-f arg specify the format in which to return the defect information.
The target may decide to fail reporting defect information in
unsupported formats or decide to return data in a different
format. scsiinfo supports all SCSI-II specified defect formats:
logical blocks. Use of this format is discouraged as the
assignment of logical blocks varies according to format
parameters and status of the defect list, hence is no
unique specification of defects.
physical blocks. Return defect as cylinder, head,
physical sector triples.
defect bytes from index. Return defect as cylinder,
head, byte offset from index. The SCSI-II standard is not
very clear on this to me. It is unclear to me if there is
a single bad byte, this offset away from the index hole
on the disk (this is only figuratively, there won’t be a
hole as used to be on 5 1/4" floppy disks), or if all
bytes from the index to this position are considered to
SCSI-II mode pages
-C displays information from Control Mode Page. (Page 0Ah, section
-D displays information from Disconnect-Reconnect Page. (Page 02h,
-p displays information from Peripheral Device Page. (Page 09h,
-c displays information from Caching Page. (Page 08h, section
-f displays information from Format Device Page. (Page 03h,
-n displays information from Notch and Partition Page. (Page 0Ch,
A huge scsi disk might be divided into several notches. These
are regions of logical blocks or cylinders on the disk. Each
such notch might have different values for the other mode pages.
Typically a modern disk will have several notches and have more
sectors per track on the inner tracks/notches on the disk and
more sectors per track on the outer (longer) tracks for optimal
capacity. Also different amounts of reserved backup sectors may
be available in the notches depending on their capacity.
-e displays information from Error Recovery page. (Page 01h,
-g displays information from Rigid Disk Drive Geometry Page. (Page
04h, section 18.104.22.168)
-V displays information from Verify Error Recovery Page. (Page
07h, section 22.214.171.124)
Select mode page set
By default the current settings are queried from the devices. You can
however specify one of these:
-M displays manufacturer defaults instead of current values.
-S displays defaults saved in NVRAM instead of current values.
-m displays modifiable fields instead of current values (All bits
set in modifiable fields).
-v Show scsiinfo version.
-vv Dump sense buffer in case of error.
-a All of the above (expect listing defects).
-l List scsi devices known to the system.
-L List mode pages pages supported by this scsiinfo version and
target (notched pages and active notch are also returned).
-X displays output suitable for the X-based interface. Instead of
nice explanations, just the bare values are written to stdout.
-R Replace parameters. Use with -X and specify the values to set on
the command line in the order and format as -X uses to report
them. (Expert use only, definitely use the Tcl/Tk interface
Use this in conjunction with -S to modify the NVRAM settings.
-X and -R can be used only with one of the display page options.
-m and -M cannot be used with -R.
You may use -M, -S with -L though it will make no difference. As a
special goodie when using -LXR then a /bin/sh script is written to
stdout that will restore the current settings of the target when
executed. You can use one of -M, -S with -LXR to save the corresponding
Restrictions of the SCSI_IOCTL_SEND_COMMAND ioctl(2) call make it
impossible to send or receive more than 4096 bytes of arguments. This
could be avoided by using the proper generic scsi device /dev/sg*
instead, at least where the kernel is compiled to support it. Most of
the time this is not needed though and thus I’m myself to lazy to do
it. It will basically just truncate the vendor specified primary defect
lists. Thus I’m too lazy to fix it.
scsi-config(8), scsiformat(8), tk_scsiformat(8), fdisk(8), sd(4),
American National Standard
for information systems
SMALL COMPUTER SYSTEM INTERFACE - 2
MARCH 9, 1990
Michael Weller <firstname.lastname@example.org>, Versions 1.5 & 1.7