Re: [Xen-users] XCP on HW RAID - how to?

[Stanislav Datskevich <me@xxxxxxxxxxxxxxx>]

Hi again. I've found this manual:
http://www.xen.org/files/XenCloud/ddk.pdf

But I can't find DDK iso. XCP DDK does not exist yet, right?

08.07.2011 11:53, Stanislav Datskevich:
> Hi. I'm using HW RAID too (but LSI 3ware 9750) and want to install XCP 
> 1.0 on it. I think it will be much faster than mdraid.
> Can I integrate driver to the distro somehow?
>
> 07.07.2011 13:20, Simon Hobson:
> > Rudi Ahlers wrote:
> >
> > > I would simply disable the RAID setup in the BIOS and then configure a
> > > mdraid in Linux. By the sounds of it you have what's called "fakeraid"
> > > and will probably have more trouble trying to get Linux to see the
> > > drives, than trying to figure out how to setup software RAID on Linux
> > > :)
> > That's my thinking as well. As it happens I've just been 
> > updating/upgrading some of my boxes. One new (to me box doesn't have 
> > raid so that forced me to use Linux software raid. The next one I did 
> > is Dell box with built in hardware raid - but I've disabled that and 
> > gone software raid again because it gives me more flexibility and 
> > visibility. Only one of the three Dell boxes I have has any Linux 
> > support for the raid controller AFAICT.
> > I'd tended to steer clear of software raid because of the problems 
> > booting from an array before you've loaded the software needed to 
> > access it. Then I came across this neat trick ...
> > You can setup a small boot volume as raid 0 (mirrored) - you can add 
> > all your drives. The trick is to run "grub-install /dev/sdx" for each 
> > drive. This means that every drive in the array has a copy of the 
> > boot loader (GRUB) and the required files (initrd, vmlinuz, etc). In 
> > other words, the system can be booted from any single drive - and the 
> > initrd has the software needed to then access everything else.
> > Obviously, booting off only one drive probably doesn't make sense for 
> > many array configurations.
> > Now I'm a convert. The last box I upgraded had new (larger) drives. 
> > It was really handy to be able to configure the raid with a drive 
> > missing since the supplier shipped one less than ordered. Then when 
> > the missing drive arrived I just added it, told mdadm to add it to 
> > the arrays, and let it build the data on it.
> >
> > But in relation to the query. Once you have supported raid volumes, 
> > then what you run on top of it doesn't really matter. Ie, as far as 
> > XCP (or any other software) is concerned, it shouldn't matter if a 
> > disk partition is on a hardware raid, software raid, single disk, ...
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