[Stgt-devel] VTL - tgtadm syntax additions (Long)

[Mark Harvey]

On 3/26/07, Ming Zhang <blackmagic02881 at gmail.com> wrote:
> On Mon, 2007-03-26 at 16:37 +1000, Mark Harvey wrote:
> > On 3/26/07, Ming Zhang <blackmagic02881 at gmail.com> wrote:
> > > On Mon, 2007-03-26 at 10:19 +1000, Mark Harvey wrote:
> > > > As the idea of hijacking the 'backing file' for use as a configuration
> > > > file has not received the most positive resonse, I have put together
> > > > some ideas for adding to the syntax of tgtadm to allow the
> > > > configuration and customization of SSC and SMC devices.
> > >
> > > looks fine to me. then u also need command to load/eject virtual
> > > cartridge? and each cartridge will need some parameters as well?
> >
> > Good point. To load virtual media into a single SSC device, some way
> > of a user being able to identify the virtual media name will be
> > required (from a command line).
>
> yes, need a barcode, and maybe a WORM media or not, and blah blah u can
> think of. :P
The 'media type' is set in the virtual media 'header'. I reserve the
first xxx bytes of the file for MAM, where the media type is defined.
e.g. WORM, Cleaning, Data etc.

I have another utility to make the virtual media. i.e. Create a file
and create a default MAM record.

>
> >
> > The 'load' and unload / eject commands are sent to the tape drive
> > itself. Its more a matter of being able to specify the media ID /
> > barcode. The Load command is an 'open()', while a eject is a 'close()'
>
> yes. we have 2 set, one set from backup app and another from emulation
> the user actions on physical drives.
>
> >
> > There will be some sort of internal interface between the SMC and SSC
> > so a 'path name' to the virtual media can be passed. e.g. A MOVE
> > MEDIUM command will basically pass the virtual media name (filename)
> > to the SSC Logical unit.
>
> yes, will you emulate ADI as well?
ADI ??

> > My current implementation (non-iSCSI) uses a messageQ. I'll most
> > likely use what every the tgtadm/tgtd uses. Currently I pass "load
> > barcode" to load "stand-alone" media and the SMC device sends a 'lload
> > barcode' command via the messageQ.
>
> sounds ok to me. as long as these commands are defined in a command
> table and documented!
> >
> > Regards
> > Mark
> >
> > >
> > > >
> > > > I have not attempted to implement any of the syntax, but am posting to
> > > > the list for comments before putting any effort into coding.
> > [snip]
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>
>