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

[Ming Zhang]

On Tue, 2007-03-27 at 11:30 +1000, Mark Harvey wrote:
> 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.

ok. so tgtadm only need to load and unload it.

> 
> >
> > >
> > > 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 ??

as Doug pointed out, ADC and ADI. sorry for confusion.


> 
> > > 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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> > > Stgt-devel at lists.berlios.de
> > > https://lists.berlios.de/mailman/listinfo/stgt-devel
> >
> >