[Bill BAO]
> is there anybody doing the parity generation by using the
> drive XOR cmd (XDWRITE, XDREAD, XDPWRITE) ?
>
> we will start this kind of work in Linux raid,
> want to know anybody else is also doing the same thing.
> we're looking for cooperation.
When I last reviewed FC-AL, I have to admit that the benefits of the
new SCSI commands XDWRITE and XPWRITE (along with BUILD and REBUILD)
fascinated me. I can't (at the moment) see this going into the Linux
s/w raid, though, mainly because it's so FC-specific (in my experience)
and would appear to violate the abstraction layer that the raid code
can exist at now.
I'm also not sure how much (if any) it buys you when the raid5 can be
dispersed over multiple controllers, multiple PCI busses, etc.
Since you've (obviously :) thought and considered this more than I, could
I talk you into a brief explanation of what (besides the bus trasfers
4->2, h/w raid controller actions 6->1) and how this can help s/w raid?
It'll also give you a great chance to alleviate any worries and quell
any issues before they get brought up :)
Thanks,
James
