Bug#557359: Can't detect multipath devices

[Felix Zielcke]

Am Samstag, den 21.11.2009, 18:30 +0100 schrieb Guido Günther:
> Package: grub-common
> Version: 1.97+20091115-1
> Severity: critical
> File: /usr/sbin/grub-probe
> 
> Hi,
> grub-probe is unable to handle multipath devices:
> 
> node1:~# dpkg --configure -a
> Setting up grub-pc (1.97+20091115-1) ...
> Generating core.img
> grub-probe: error: no mapping exists for `mpath0-part1'
> Auto-detection of a filesystem module failed.
> Please specify the module with the option `--modules' explicitly.
> dpkg: error processing grub-pc (--configure):
>  subprocess installed post-installation script returned error exit
> status 1
> dpkg: dependency problems prevent configuration of grub:
>  grub depends on grub-pc; however:
>   Package grub-pc is not configured yet.
> dpkg: error processing grub (--configure):
>  dependency problems - leaving unconfigured
> Errors were encountered while processing:
>  grub-pc
>  grub
> 
> This breaks upgrades from Lenny to sid. The multipath map is:
> 
> # multipath -l
> mpath0 (SQEMU   QEMU HARDDISK  ) dm-0 QEMU,QEMU HARDDISK
> size=10G features='0' hwhandler='0' wp=rw
> `-+- policy='round-robin 0' prio=-1 status=active
>   `- 0:0:0:0 sda 8:0 active undef running
> 
> # dmsetup info /dev/mapper/mpath0
> Name:              mpath0
> State:             ACTIVE
> Read Ahead:        256
> Tables present:    LIVE
> Open count:        2
> Event number:      1
> Major, minor:      254, 0
> Number of targets: 1
> UUID: mpath-SQEMU   QEMU HARDDISK  
> 
> Reinstalling grub-legacy works around the issue.
> Cheers,
>  -- Guido

Looks like you forgot about 483971 and 442382.
and maybe even others. Haven't looked this multipath issue now all up.
But i remembered it was you who has interest in multipath support inside
debian-installer and so grub2 too.
I'm a bit unsure if I should just merge this with 483971 or reassign at
GRUB Legacy, where the dummy grub package still is, and add a debconf
note that gets shown when multipath is detected and tells people to keep
Legacy for now.

But it still looks like that you're the only one for whom multipath is
important. (Well and Frans who considers this as a blocker, but it
didn't block the switch to grub2 as default for d-i alpha1)

-- 
Felix Zielcke
Proud Debian Maintainer and GNU GRUB developer