queries information from an scsi target. This means generally using the
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)
display all information from the
displays the unit serial number using the
display factory and grown defect lists (typically for disks only).
It is currently only possible to return defect information up to 4096 bytes. Longer
defect lists are truncated. See the
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.
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 be bad.
SCSI-II mode pages
displays information from Control Mode Page.
displays information from Disconnect-Reconnect Page.
displays information from Peripheral Device Page.
displays information from Caching Page.
displays information from Format Device Page.
displays information from Notch and Partition Page.
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.
displays information from Error Recovery page.
displays information from Rigid Disk Drive Geometry Page.
displays information from Verify Error Recovery Page.
Select mode page set
By default the current settings are queried from the devices. You can however
specify one of these:
displays manufacturer defaults instead of current values.
displays defaults saved in NVRAM instead of current values.
displays modifiable fields instead of current values (All bits set in modifiable fields).
All of the above (expect listing defects).
List scsi devices known to the system.
List mode pages pages supported by this
version and target (notched pages and active notch are also returned).
displays output suitable for the X-based interface. Instead of nice explanations, just the
bare values are written to stdout.
Replace parameters. Use with
and specify the values to set on the command line in the order and format as
uses to report them. (Expert use only, definitely use the Tcl/Tk interface
Use this in conjunction with
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
You may use
-M, -S with -L
though it will make no difference. As a special goodie when using
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 values.
Restrictions of the
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
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.