On Wednesday February 28, jason.d.gaston@xxxxxxxxx wrote: > Thanks for the archive link, very interesting discussions with EMD... > > What was the final outcome with EMD? Is it still a valid project? > > We would like to start helping with RAID feature enhancements, but we > need to maintain support vendor specific metadata. What is the best way > to approach this? Pick up EMD again, add to DMRAID, add to MD RAID or > something else? We want to do the right thing by the community. Can > anyone point me in the right direction with where to begin? I'm keen on making md/raid work with vendor-specific metadata. I aim to achieve that by making it possible to do all the metadata handling in userspace, and then maybe support loadable modules in mdadm for different specific metadata. I've been aiming to get DDF supported, but things keep distracting me :-( I only vaguely remember the EMD effort. My memory is that a pile of code appeared that did a variety of useful things, but there were lots of aspects that I wasn't comfortable with. i.e. it needed a bit of revision before it was suitable for mainline, but there was no followup from the coders. I would suggest that the "right thing by the community" is to present some details on what specifically you want to achieve and start a discussion on how best to achieve that. Then see where things lead. For raid1/4/5/6, I would strongly recommend starting with the md code-base. If it seems like a good idea to put a 'dm' interface on top of that, then it could probably be arranged. If more functionality is needed internally, or better interfaces needed to achieve particular ends, then that is certainly possible to. NeilBrown - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
