URL:
<http://savannah.gnu.org/bugs/?38406>
Summary: GRUB assembles wrong disks for md RAID device
Project: GNU GRUB
Submitted by: gigatux
Submitted on: Mon 25 Feb 2013 11:25:32 GMT
Category: Booting
Severity: Major
Priority: 5 - Normal
Item Group: Software Error
Status: None
Privacy: Public
Assigned to: None
Originator Name: Marc Warne
Originator Email: [email protected]
Open/Closed: Open
Discussion Lock: Any
Release:
Release: 1.98
Reproducibility: Every Time
Planned Release: None
_______________________________________________________
Details:
Hi,
I haven't yet attempted to reproduce this as it occurred on a production
system that I needed to get up as soon as I could, but when it was an issue,
it was fully repeatable.
Scenario:
1. /boot stored on a four disk MD RAID-1 array.
2. Two disks had failed simultaneously.
3. Upon GRUB boot, GRUB was assembling the two failed disks (which comprised
a valid but somewhat old filesystem) instead of the two more recently updated
disks.
My best guess is that GRUB isn't taking account the relevant timestamps on the
RAID members which should specify when they were last updated.
It should be possible to reproduce this by failing two md devices
simultaneously and then getting GRUB to use it as its filesystem. I'm not sure
which two would need to fail (e.g. does GRUB just use the devices with the
lowest numbers?) but I think some simple checking of timestamps would be
required.
_______________________________________________________
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