RE: [Xen-users] crazy SWAP and RAM idea

[Luke Crawford <lsc@xxxxxxxxx>]

On Sun, 10 Sep 2006, Steffen Heil wrote:
> > You also risk DB corruption, (not to mention inode corruption
> > [are you using ext3? I hope not, or you're looking to start
> > grepping for your data using strings you hope exist in the
> > files you lost] ). Just wait until a dom-u is being hammered
> > and dom-0 experiences an unorderly shutdown, hope you've
> > polished up on your regex to find your data :)
> I don't understand that at all. First, if ext3 (which DOES have journaling)
> looses any data on unclean shutdown, then it is faulty. And yes, I use it on
> several machines. And secondly I think that farly depends how you implement
> domU partitions. Mine are LVM...
Unless you are writing to the journal synchronously, (which nobody does; 
that makes it just as slow as mounting the filesystem synchronously; 
even slower, as you have two steps)  the journal only protects filesystem 
integrity... not the integrity of files that are open.  Essentially, it is 
a way of ordering meta-data writes (just like softupdates on FreeBSD))
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