[CI] Re: [SSI] Back online (Firewire)

[Lyle B. <lbi...@bi...>]

I checked the GFS (Sistina), and IEEE 1394 FAQ's and mail lists and
found that firewire is specified to be capable of sharing a HDD with
multiple systems, but that no vendors are currently supporting that
capability in hardware.

Those who have tested a single firewire HDD with multiple system access
have said that whichever system initially gains control over a firewire
HDD, it is never released - and therefore the HDD cannot be accessed by
a second system.

As I recollect, there were suggestions that Microsoft didn't want to
support firewire HDD sharing in Windows, therefore the HW manf. didn't
bother to implement the capability (not verified by me - but it does
kinda ring true).

Lyle

"Brian J. Watson" wrote:
> 
> Christoph Hellwig wrote:
> > > I'm not sure how difficult of a hack it would be to get GFS working on
> > > FireWire. You might pose this to Sistina and the OpenGFS group.
> >
> > It will run over ieee1394 surely - the prolem is lack of memexp support.
> 
> Isn't this just a problem for DMEP hardware on IEEE1394? My
> understanding of the memexpd form of locking is that it is strictly IP
> based.
> 
> --
> Brian Watson                | "The common people of England... so
> Linux Kernel Developer      |  jealous of their liberty, but like the
> Open SSI Clustering Project |  common people of most other countries
> Compaq Computer Corp        |  never rightly considering wherein it
> Los Angeles, CA             |  consists..."
>                             |     -Adam Smith, Wealth of Nations, 1776
> 
> mailto:Bri...@co...
> http://opensource.compaq.com/

-- 
Lyle Bickley             | Bickley Consulting West Inc.
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