Re: What's the Debian way of disabling suspend to disk?
On Fri, 03 Sep 2010, Celejar wrote:
> On Thu, 2 Sep 2010 14:32:03 -0300
> Henrique de Moraes Holschuh <hmh@debian.org> wrote:
>
> ...
>
> > That said, I don't trust hybernation. Your data is much safer in the
> > long run if you restrain yourself to suspend-to-RAM and shutdowns.
>
> Can you elaborate on this? I have certainly experienced my share of
Yes. Suspend-to-disk on Linux x86/amd64 depends on fragile operations, and
worse, it requires that the hibernation core and some of the more fiendishly
complex kernel subsystems never disagree at all on the details.
That can easily result in silent, hard-to-track data corruption when code
changes. When you're very lucky, it hoses the kernel or the filesystem
metadata in a way which can be easily noticed by some kernel assertion,
resulting in an OOPS or warnings. If you're unlucky, it can slowly rot away
your filesystem or the data inside it.
Restoring from an hibernation image also does nasty things to the ACPI
firmware. But at least any problems there are much more likely to cause the
box to fail to resume entirely, instead of truly evil stuff like silent
filesystem or application memory space corruption.
> or do you mean the much more serious problem of the hibernation image
> becoming corrupted and the system not realizing this? I though that
It is not the hibernation image getting corrupted. It is running system
state getting corrupted due to bad interaction between parts of the kernel,
or outright kernel bugs.
Suspend-to-RAM is much easier to get right (and *keep* right), and far less
fragile.
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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