When RAID 10 is SLOWER than RAID 1, why?
- by Paul
We have a Dell 2950 with PERC and 14 external SAS 15K 73GB drives. An Oracle database job takes 3 hours to run with the drives set as hardware RAID 10 (striped across 7 mirrored pairs). The same job with the drives in RAID 1 takes only 1 hour. OS is Win 2008 R2 I think.
Before we change the RAID level (with considerable downtime) on the production box, does anyone know why we're seeing this odd result, and if there's a better way to fix it?