Could raid-enabled kernel be made available?

Bug #12052 reported by Michael Hipp
6
Affects Status Importance Assigned to Milestone
kernel-package (Ubuntu)
Fix Released
Wishlist
Colin Watson

Bug Description

Would it be possible to make a raid-enabled kernel available so systems could be
installed with raid? It would be good to be able to put /boot and / in a raid
device. (Even putting that kernel in Universe would be ok, tho it would be nice
to be able to install into raid from the install CD).

I realize Ubuntu is mostly focused on the desktop, but server use is also
"encouraged" and "supported". And raid is critical for server use. Besides, raid
usage on high-end desktops is quite common. Thank you.

Revision history for this message
Matt Zimmerman (mdz) wrote :

The default kernel supports RAID, and installing onto a RAID device is supported
by the Warty installer, so you'll need to be more specific about what went wrong
for you.

Revision history for this message
Michael Hipp (michael-hipp) wrote :

Thank you. The installer offers a dire warning that installing /boot and /
(root) onto a raid device is not supported and it says the system will not boot
if you do so. I am also taking cues from this thread (
http://ubuntuforums.org/showthread.php?t=7293&highlight=raid+kernel )where it is
stated that a custom kernel is needed to support raid and it details
considerable machinations that were required to get /boot and / to work on raid.

Is the warning incorrect or else what am I not understanding?

(I recently switched to Ubuntu from RH/FC and I realize Ubuntu is probably not
attempting to replicate the "kitchen sink" kernels of RH, but I am convinced of
the need to put all partitions into raid for redundancy purposes.)

Revision history for this message
Matt Zimmerman (mdz) wrote :

(In reply to comment #2)
> Thank you. The installer offers a dire warning that installing /boot and /
> (root) onto a raid device is not supported and it says the system will not boot
> if you do so. I am also taking cues from this thread (
> http://ubuntuforums.org/showthread.php?t=7293&highlight=raid+kernel )where it is
> stated that a custom kernel is needed to support raid and it details
> considerable machinations that were required to get /boot and / to work on raid.
>
> Is the warning incorrect or else what am I not understanding?

I'll defer to Colin regarding the installer. The information about the kernel
in that thread is incorrect, though. There is no need to build a custom
kernel, and the automatic initrd building process will add the necessary modules
and commands to the initrd to initialize RAID before mounting the root filesystem.

Revision history for this message
Colin Watson (cjwatson) wrote :

The dire warnings about installing onto RAID1 (the only level supported for / or
/boot at the moment) were removed in partman-md 17, which we have in Ubuntu
5.04. RAID1 installations should work fine these days.

Revision history for this message
Colin Watson (cjwatson) wrote :

(except that you may need to tweak the bootloader configuration a bit; I've seen
grub have problems)

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