I have 2 DAE's filled with the CX-SA07-020 drives (30 drives total)

Ive got that setup as 2 disk groups, Raid-5, 14+1.

I creates a bunch of luns on both disk groups and presented to host.

On the host, I striped the luns using a stripe-width of 2, meaning that im only hitting a pair of luns (one from each disk group) at a time.

The performance is really poor.

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await  svctm  %util

dm-2           4264.80     0.00  634.80    0.00   307.36     0.00   991.62   133.45  207.95   1.58 100.00

dm-4           4240.40     0.00  659.00    0.00   308.89     0.00   959.94   114.14  173.42   1.52 100.00

dm-12             0.00     0.00 9780.60    0.00   610.15     0.00   127.76  1913.81  194.36   0.10 100.00

dm-2 and dm-4 are the individual luns, one from each DAE (and controller).

dm-12 is the stripe itself and is being used as a filesystem.

As the numbers show, the wait times are extreem, the utilization is 100% and the throughput (both read and write) are peaking around 600MB/sec.

I also tried a smaller number of disks in a disk-group, and that was worse. The 2 large disk groups yeilds the best performance, but it's well below what I was hoping for with 30 drives backing the store.

Would 4x DAE's with the 2Tb drives get me twice the throughput?

Any suggestions would be helpfull.