linux-kernel - vmlinuz resume=/dev/md0 borks swap ( unlike /dev/sda1 )

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Message-Id: <N1N-U8gRtCsRlA@Safe-mail.net>
Date:	Sat, 15 Mar 2008 04:47:27 -0400
From:	"Antryg Revok" <antrygrevok@...e-mail.net>
To:	linux-kernel@...r.kernel.org
Subject: vmlinuz resume=/dev/md0 borks swap ( unlike /dev/sda1 )

I'm not subscribed
( tried that once, and couldn't use that e-mail account again, due to swamping )
so please cc me to replies, if you feel I might help further. . .

circumstance:
openSUSE 10.3 x86_64 ( on an X2 ), 4GB RAM, 4GB swap ( some apps do go bonkers, sometimes ) on /dev/md0 ( raid-1 /dev/sda1 /dev/sdb1 )

/boot/grub/menu.lst

# Modified by YaST2. Last modification on Fri Mar 14 17:02:28 EDT 2008
default 0
timeout 8
gfxmenu (hd0,2)/boot/message
##YaST - activate

###Don't change this comment - YaST2 identifier: Original name: linux###
title openSUSE 10.3 - 2.6.22.17-0.1
    root (hd0,2)
#kernel /boot/vmlinuz-2.6.22.17-0.1-default root=/dev/md2 vga=0x375 dma resume=/dev/md0 splash=verbose showopts
    kernel /boot/vmlinuz-2.6.22.17-0.1-default root=/dev/md2 vga=0x375 dma splash=verbose showopts
    initrd /boot/initrd-2.6.22.17-0.1-default

###Don't change this comment - YaST2 identifier: Original name: failsafe###
title Failsafe -- openSUSE 10.3 - 2.6.22.17-0.1
    root (hd0,2)
    kernel /boot/vmlinuz-2.6.22.17-0.1-default root=/dev/md2 vga=ask showopts ide=nodma apm=off acpi=off noresume edd=off  3
    initrd /boot/initrd-2.6.22.17-0.1-default

I couldn't get swap to activate on /dev/md0
when the "resume=..." bit was in there, and
I couldn't get mdadm to stop /dev/md0
( btw, the manpage for mdadm is wrong, at least in syntax, on opensuse 10.3 )
it complained that the thing was still in use, but nothing in /etc/fstab was identified as being on it
( I'd commented-out the swap line, to minimize complexity ), and I couldn't find anything else that seemed to be using it.

lsof | grep md0
md0_raid1 2283 root cwd DIR 9,2 4096 2 /
md0_raid1 2283 root rtd DIR 9,2 4096 2 /
md0_raid1 2283 root txt unknown /proc/2283/exe

Then removing that "resume=..." from grub's menu.lst bit fixed swap.
/dev/md0 /could/ be activated as swap, then, and /dev/md0 behaved as a normal raid device, being stoppable & runnable.

I *need* this machine to be redundant-everything, very-very-reliable, because it's going to someone who can't geek, and they need it to work.
( which is the reason I'm not permitting MS-Windows anywhere near the metal )

Presumeably the resume stuff wasn't /intended/ to require a non-raid-1 partition if it is to co-exist with swap, 
I think it was an oversight, 
but maybe it's impossible?

My current "solution" is to rip all suspend/hibernate system/sw from this machine, to prevent any problems with the system "assuming" that the resume-data exists.

Please get the fixers to perceive the problem, if youse can, & thanks in advance, eh?

  : )
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