Hi, We are trying to do a good configuration of our SAN. Let's see that exemple. EMC, with disk of 146G. - one LUN of RAID-5 for data (4+1 disks = 534G) - one LUN of RAID-5 for index (4+1 disks = 534G) Here is my question, about redo logs - one LUN of RAID-1 for redo group 1 (2 disks mirroired = 146G) - one LUN of RAID-1 for redo group 2 (2 disks mirroired = 146G) - one LUN of RAID-1 for my archived log files (2 disks mirroired = 146G) I will have a filesystem of 146G to store my redo group of 2G .... what a waste. Same thing for my redo group 2 and my archived log files ... What is your LUN configuration regardinf redo log groups and archived log files ? Thank you -- Luc Demanche Oracle DBA (514) 867-9977 -- //www.freelists.org/webpage/oracle-l