Hibernate to LVM

Hibernate to LVM

[Donald W Watson]

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I am using the 2.6.10 kernel (linux-2.6.9.tar.bz2 with patch 2.6.10.bz2) on
an older IBM ThinkPad (T20 booted with acpi=force).

I have seen no discussion of the following in the archives.  Hibernate (S4)
does not work if the swap partition is on an LVM Logical Volume.  The
reason is that try_name (init/do_mounts.c) is unable to find the partition
in /sys/block.

Further, if a second swap partition is established on a regular partition
and referenced in the "resume" state in menu.lst, hibernate appears to
succeed, but on resume check_sig (kernel/power.swsusp.c) complains because
the swsusp_header signature is "SWAPSPACE2" rather than the hard-coded
"S1SUSPEND" which it expects.

Are these deliberate design decisions?

Sincerely,    Don Watson
Linux Technology and Solutions; Beaverton, OR
503-578-4861/TL: 775-4861; dwatson-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org

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Re: Hibernate to LVM

[Bernard Blackham]

On Thu, Jan 13, 2005 at 01:41:35PM -0800, Donald W Watson wrote:
> I have seen no discussion of the following in the archives. Hibernate (S4) does
> not work if the swap partition is on an LVM Logical Volume.
[...]
> Are these deliberate design decisions?

The in-kernel swsusp can not be built as a module. As a consequence,
it will always try to resume before an initrd/initramfs has been
executed. LVM setup (AFAIK) generally takes place in an initrd, or
off a separate boot partition once the kernel has booted. Hence,
impossible.

On the other hand, Software Suspend 2 should support it:
http://softwaresuspend.berlios.de/ - it'll need a bit of tweaking of
your initrd to tell it when to resume though.

Bernard.

-- 
 Bernard Blackham <bernard at blackham dot com dot au>


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Re: Hibernate to LVM

[Pavel Machek]

Hi!

> > I have seen no discussion of the following in the archives. Hibernate (S4) does
> > not work if the swap partition is on an LVM Logical Volume.
> [...]
> > Are these deliberate design decisions?
> 
> The in-kernel swsusp can not be built as a module. As a consequence,
> it will always try to resume before an initrd/initramfs has been
> executed. LVM setup (AFAIK) generally takes place in an initrd, or
> off a separate boot partition once the kernel has booted. Hence,
> impossible.

Actually, I think I took a patch that enables you to trigger resume from userland.
Check /sys/power in 2.6.11rc1.

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Re: Hibernate to LVM

[Pavel Machek]

Hi!

> I am using the 2.6.10 kernel (linux-2.6.9.tar.bz2 with patch 2.6.10.bz2) on
> an older IBM ThinkPad (T20 booted with acpi=force).
> 
> I have seen no discussion of the following in the archives.  Hibernate (S4)
> does not work if the swap partition is on an LVM Logical Volume.  The
> reason is that try_name (init/do_mounts.c) is unable to find the partition
> in /sys/block.

Well, I'd say that this is currently unsupported.

> Further, if a second swap partition is established on a regular partition
> and referenced in the "resume" state in menu.lst, hibernate appears to
> succeed, but on resume check_sig (kernel/power.swsusp.c) complains because
> the swsusp_header signature is "SWAPSPACE2" rather than the hard-coded
> "S1SUSPEND" which it expects.

...but this one should be fixed. suspend should only write to partition
you specified with resume= parameter. If that is not the case, feel free to fix
it and send me a patch.

				Pavel
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