EVA4400/6400/8400 - more than 4gbps throughput per LUN possible?

[sam bell]

I just ran the same test again with a different configuration:

- EVA 4400 with 36 10k 300GB disks
- Vraid 5
- two fabrics with each fabric connected to one port of each controller
- host with two 4gbps FCAs, one connected to fabric A and one to fabric B

Theoretially I should be able to reach 8gbps:

1x 4gbps to controller A on FCA 1
1x 4gbps to controller A on FCA 2

In this case, the sequential read test with IOmeter showed 510mb/s.

I'll test this host later with the EVA 6400.

[Johan Guldmyr]

Looking good!

Maybe the disks couldn't do more on the last one.

The EVA likes 128KB block sizes. Smaller is OK but I believe I've seen smoe graphs picturing that iops etc increases until you reach 128k.

You can use evaperf (comes with Command View) to see performance stats (capture and real time).

[Michael A. McKenney]

4 Gbps = 500 MB/s transfers. 15K SAS drives can do about 80-130 MB/s transfers each. So in RAID 10, you should be able to do 500 MB/s transfers on reads and writes. In RAID 5, reads could reach it but writes will not come close.

At home, I have a LSI Logic MegaRAID 8708EM2 controller with 128MB DDR 667 battery cache. I can get 1.097 GB/s cached reads and 850 MB/s cached writes from RAID 1. RAID 5 writes on 4 drives were 40 MB/s and read were over 1.3 GB/s. RAID 10 was the best choice.