All
My box was randomly locking up (the disk light would stay on) I managed to recreate it it with bonnie, it would lock up every time.
Anyhow the fix seems to be to add noapic to the kernel params, thanks to RHEL 3 U3 notes for that
https://www.redhat.com/docs/manuals/...x86_64-en.html
Seems to fix FC2 as well
box is gigabyte k8n pro with segate SATA disk, I'll post more details if anyone wants them.
Lee