Re: [ANNOUNCE] sdparm 0.90

[Douglas Gilbert <dougg@torque.net>]

folkert@vanheusden.com wrote:
> oh wait, 2.6 yes?

In lk 2.4 you get to use sg device nodes as noted in
the man page ;-) sg_map (in sg3_utils) will show the
mapping.

If sdparm is popular I could add a SCSI_IOCTL_SEND_COMMAND
interface for lk 2.4 as a fall back. Alternatively sdparm
could internally iterate like sginfo does (in sg3_utils)
to find the mapping to a sg device node.

Doug Gilbert

> then forget my bugreport (running 2.4.26-NANO)
> 
> On Mon, Apr 18, 2005 at 11:26:03PM +1000, Douglas Gilbert wrote:
> 
>>sdparm is a new command line utility designed to get and set
>>SCSI disk parameters (cf hdparm for ATA disks). More generally
>>it gets and sets mode page information on SCSI devices or devices
>>that use a SCSI command set (e.g. CD/DVD drives (any transport)
>>and SCSI tape drives).
>>
>>The elements within mode pages are addressed via acronyms
>>(e.g. "WCE" for "write cache enable" in the caching mode
>>page). There is also numeric addressing of the form:
>><start_byte>:<start_bit>:<num_bits>
>>This symbolic or numeric addressing should be more
>>convenient for changing parameters than the techniques used
>>by scsiinfo, sginfo and sg_wr_mode.
>>
>>A GUI wrapping sdparm would be a useful extension.
>>It could show the mode page as found in the standard or
>>the vendor's product manual with attributes such as
>>"changeable" represented by colour or shading.
>>
>>I hope to add VPD pages in the future. sdparm shares some
>>code with sg3_utils but is currently independent; they may
>>share a library (libsgutils) in the future.
>>
>>A tarball, rpms and a "deb" can be found on
>>http://www.torque.net/sg .
>>Currently, the most complete documentation is in the
>>man page.
>>
>>
>>Examples (taken from the man page):
>>To list the common (mode) parameters of a disk:
>>
>>    sdparm /dev/sda
>>
>>To see all parameters for the caching control mode page:
>>
>>    sdparm --page=ca /dev/sda
>>
>>To get the WCE values (current changeable default and
>>saved) in hex:
>>
>>    sdparm -g WCE -H /dev/sda
>>  0x01 0x00 0x01 0x01
>>
>>To get the WCE current value in hex:
>>
>>    sdparm -g WCE=1 -H /dev/sda
>>  0x01
>>
>>To set the "write cache enable" bit in the current page:
>>
>>    sdparm --set=WCE /dev/sda
>>
>>To set the "write cache enable" bit in the current and
>>saved page:
>>
>>    sdparm --set=WCE --save /dev/sda
>>
>>To set the "write cache enable" and clear "read cache
>>disable":
>>
>>    sdparm --set=WCE --clear=RCD --save /dev/sda
>>
>>The previous example can also by written as:
>>
>>    sdparm -s WCE=1,RCD=0 -S /dev/sda
>>
>>To re-establish the manufacturer?s defaults in the
>>current and saved caching control mode page:
>>
>>    sdparm --page=ca --defaults -save /dev/sda
>>
>>If an ATAPI cd/dvd player is at /dev/hdc then its common
>>(mode) parameters could be listed with:
>>
>>          sdparm /dev/hdc
>>
>>
>>Comments, suggestions and patches welcome.
>>
>>
>>Doug Gilbert
>>-
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> 
> 
> 
> Folkert van Heusden
>