We are having IO performace issues on a busy terminal server that currently has 2x10k RPM drives running RAID1. We intend to replace with 6x15k RPM drives. The users mostly run IE, Outlook, Excel, MAS90 accounting.
We are trying to decide whether to put all 6 drives in a single RAID0+1 array or put the OS and userprofiles on 2 disks at RAID1 then run the accounting app and shared files off the other 4 at RAID0+1. I argue that since it's all going through one controller, putting all 6 in one array with 1 logical drive will yield the best performance because it's more spindles handling a given amount of IO, my collegue thinks that we will get better performance by separating into 2 logical drives.
Thoughts? (it's an 8 core dell with PERC5/i and 16gb RAM)