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

[Stanislav Datskevich <me@xxxxxxxxxxxxxxx>]

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, ...
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users