Many thanks for your prompt and helpful reply.
A few comments in case of benefit to others -
1 - CPU is early Xeon we think - 32 bit. Looking at adding second CPU if we can obtain one to improve performance.
2 - gone with 2 x RAID 1 - your comments made sense. The 4 disks are on one SATA backplane. LVM is straightforward to set up with Webmin (once your head is around the various volumes/groups etc). Not sure about performance hit - we will have to see.
Moving MysQL data directory was more awkward than originally expected as Ubuntu uses apparmor to protect configs -
see this url for solution:
eaccelerator or similar is next ....
Hardware and performance
OS and RAID questions for move from VM to real box
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