All,

we have an MD3620i with 16 SSD's. Read performance we can almost max out the 2x 10GB links on the controller that is the owner for the LUN at about 2GB/s... so no issues there .

but on writes, we get poor performance (Lun is a RAID 10) averaging about 400MB/s write speed.

so after doing some testing with various setting we find that after disabling "write cache with mirroring" the performance of writes jumps considerably to about 850MB/s

I understand what write cache mirroring is and why its important but i am wondering why its such a big performance hit on the LUN.. any ideas on how to improve it maybe? should it be such a big performance issue?

Thanks for any input