[Users] quota file not compatible between OpenVZ 32 and 64 bits

[Solar Designer]

On Fri, Apr 23, 2010 at 09:05:33AM +0200, frank wrote:
> As you explain it, it's like you upgrade to 64bits without a new 
> installation. Is that possible?

Yes, and I thought that's what you were asking about.  We tried that on
Owl systems because that's what we're using and what we're most familiar
with (obviously), but a similar approach should work on RHEL as well.

It's not a full upgrade to 64-bit - the host system remains mostly
32-bit.  It's just enough of an upgrade to be able to run a 64-bit
kernel (such as to use large amounts of RAM efficiently) and optionally
64-bit containers.

> Our intention is to make a new 64 bit 
> installation on one of our cluster nodes, move VEs there step by step, 
> and at last do the same with the remaining one.

That's a more "official" approach.

Which one you choose depends on your experience and confidence in what
you're doing and in your ability to troubleshoot and resolve possible
issues.  Also, a new install is obviously cleaner and "more complete",
whereas having a mixed 32/64 host system is "hackish".

Alexander