CX4-240 disk performance

Hi all,

I am wondering if someone could confirm or speculate regarding some performance figures we are seeing from a CX4-240.

The figures seem too slow. We would like to get a feel for other experiences if possible.

Setup overview:

Blades: RHEL5 AMD Opteron, 8GB RAM, 2x 15K SAS mirror, 2x QLogic 4Gb FC HBAs

2x Brocade 5000 FC Switches

Flare 04.29

15x 400GB 10K FC disks

15x 1TB 7.2K SATA disks

HBA's & switches at minimal workload.

Test LUNs on separate SPs (normal, not metaLUNs or Thin LUNs)

Caching disabled on Test LUNs.
Ext3 filesystems on both LUNs.

LUNs & Blade OS idle when tests were performed.

Tests performed on separate blades to confirm results.

LUN1; 3x SATA RAID5

LUN2, 10x FC RAID5

Sequential r/w, LUN1 -> LUN1: avg 13MB/s

Sequential r/w, LUN2 -> LUN2: avg 27MB/s

Sequential r/w, LUN1 -> LUN2: avg 15MB/s

Sequential r/w, LUN2 -> LUN1: avg 17MB/s

Sequential r/w, Host SAS -> LUN1: avg 16MB/s

Sequential r/w, LUN1 -> Host SAS: avg 17MB/s

Sequential r/w, Host SAS -> LUN2: avg 60MB/s

Sequential r/w, LUN2 -> Host SAS: avg 82MB/s

Any comments would be most welcome.

We are in the process of running more tests (random workload, different size RAIDs)

Best Regards,

Logan Cale