Hello,
have you solved this issue? My friend is experiencing similar issues (DELL R410, 8GB RAM, 1x E5506 CPU, ESXi installed on local drive which is 1TB connected in RAID 1 using SAS 6i) on free version of VMware ESXi 4 (two VMs: CentOS and Windows SBS 2008) and we have no idea what can we do here (except upgrading to PERC 6i of course :) ).
Thanks