Moving filesystems

I'm trying to set up a warm backup via log shipping, however when I
transfer the database filesystem(1) to the backup machine and start
postgres on it I get FATAL: incorrect checksum in control file.

Both machines are running postgres 8.2.5

The production server is running CentOS 5 (kernel 2.6.18.el5)
on a 4 CPU system (Dual Core AMD Opteron(tm) Processor 885)

The would be backup server is running CentOS 5.2 (kernel 2.6.18-92.el5PAE)
on a 2 CPU system (Intel(R) Xeon(TM) CPU 2.80GHz)

Should I expect this to work?  or am I doing something dumb shunting the
files over (I tar'ed them and had to chown'ed them as the backup machines
user and group ID differs)

(1) I have tried this the production and a minimal test database (one
schema one table)

--
Michael
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Michael John Lush PhD            Tel:44-1223 492626
Bioinformatician
HUGO Gene Nomenclature Committee    Email: hgnc@genenames.org
European Bioinformatics Institute
Hinxton, Cambridge
URL: http://www.genenames.org
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~