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Bug#497110: improved dmraid support in D-I



Hello Luke,

Thank you for your mail.

I implemented the current support in the installer during DebConf last 
year, more out of annoyance with the continuing stream of requests to 
support dmraid than out of any personal interest. By chance someone could 
make some hardware available to me for the duration of the conference.
Yes, it was a huge hack (and I've always announced and documented it as 
such), but at least it made installing to dmraid an option and it 
provided a basis to improve support.

Basically I am quite happy to see dmraid supported properly now, at least 
for partitioning. That still leaves bootloader support and bootloader 
installation essentially a hack, or do you have improvements for that 
too?

I was a bit miffed at first when Giuseppe came up with your patches, but 
that lessened somewhat when I saw they were recent. However, given that 
Debian/I had done the initial support a mail to our list even just to 
announce that you were working on this would have been very much 
appreciated. I could possibly even have helped or simplified things for 
you in a few cases as obviously I know the partman side quite well.

We're currently still waiting for Otavio to discuss the changes with the 
release team and give the go-ahead. After that getting the changes into 
SVN and uploaded for the installer should be very quick.

On Monday 08 September 2008, Luke Yelavich wrote:
> as well as making any changes I make for Ubuntu available for Debian now
> and in the future. 

Please consider - at least when it comes to changes in the installer 
itself - to work directly in the Debian SVN repository. After all, 
keeping the diff between Debian/D-I and Ubuntu/D-I small only reduces 
effort when Ubuntu rebases on unstable for a new release.

I'm quite sad to see the diff growing now that Colin Watson is less active 
when it comes to D-I.

> I am also happy to test on real hardware, as I have a few PCI cards, as
> well as a recent intel ICH9 board that I can test such configurations
> as RAID 5, and possibly RAID10/01 if desired.

That would be great.

Question: how does booting from fakeraid work with e.g. RAID5? Reading the 
bootsector will work fine, but I don't see how grub can read its stage 
files from a RAID5 array.

Cheers,
FJP

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