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xen-users
Re: [Xen-users] XCP on HW RAID - how to?
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, ...
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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