Ubuntu
debian-installer package

Herd 5 Alternative CD fails to detect configured md raid device

Bug #92645 reported by Amon_Re
This bug report is a duplicate of:  Bug #84228: RAID catch-22 on power5. Edit Remove
4
Affects Status Importance Assigned to Milestone
debian-installer (Baltix)
Confirmed
Undecided
Unassigned
debian-installer (Ubuntu)
Confirmed
Undecided
Brian Murray

Bug Description

I have a system that was setup with Edgy to use md raid1 (mirroring) and on top of the raid device, i use lvm2, with two partitions, the / filesystem and /home.

When i attempt to install herd 5 on that system, it fails to detect the already configured raid device (/dev/md0), going to "configure RAID" will offer the choice to create or delete md devices, at this point, if you select "Finish" without changing anything, or choose "Go Back", the installer will fail with the error "Could not stat /dev/md/0 - No such file or directory".

Status of the lvm device recognition is unknown, nor do i know if it actually has any connections to lvm2, running lvm vgscan from one of the consoles after the above error does show the vg device.

Revision history for this message
Brian Murray (brian-murray) wrote :

Thanks for taking the time to report this bug and helping to make Ubuntu better. Do you know if the raid1 kernel module has been loaded yet? I don't recall if it is auto loaded off the alternate CD. Thanks in advance.

Revision history for this message
Amon_Re (ochal) wrote :

I'll have to check, i think it gets loaded as soon as you select "Configure RAID devices" tho, when partitioning manually.

The /dev/md/0 error only appears *after* i goto the Configure raid section, prior to doing that i can still go back & forth between "detecting disks" and "partitioning", as soon as i accessed "Configure RAID" i am unable to do so without getting the /dev/md/0 error.

I hope this post makes sense, if not, let me know & i'll clarify some more ;)

Revision history for this message
NeoRazorX (neorazorx) wrote :

When i try to install ubuntu feisty herd 5, and i setup the raid configuration, then show the "/dev/md/1 not pressent" error.

I have 3 raid volumes:
/dev/md0, raid 1
/dev/md1, raid 0
/dev/md2, raid 0

Ubuntu 6.10 alternate CD works perfectly, but herd 4 and 5 dont work for me.

Revision history for this message
NeoRazorX (neorazorx) wrote :

I can confirm that Ubuntu 7.04 beta has the same problem :(

Changed in debian-installer:
status: Unconfirmed → Confirmed
status: Needs Info → Confirmed
Revision history for this message
Jeroen Maris (jealma) wrote :

I can confirm it as well, see bug report https://bugs.launchpad.net/ubuntu/+bug/95704

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

Thanks for your report. It appears to be deliberate that partman-md doesn't detect the RAID devices until you select "Configure software RAID" - at any rate it's always been like that and I can think of reasons why you might not want it to autodetect them (e.g. if you were about to tear down the RAID devices). However, the /dev/md/0 business is definitely a bug, specifically bug 84228.

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