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тАО04-28-2011 05:19 AM
тАО04-28-2011 05:19 AM
Re: EVA4400/6400/8400 - more than 4gbps throughput per LUN possible?
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.
- 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.
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тАО04-28-2011 07:14 AM
тАО04-28-2011 07:14 AM
Re: EVA4400/6400/8400 - more than 4gbps throughput per LUN possible?
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).
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).
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тАО04-28-2011 11:41 AM
тАО04-28-2011 11:41 AM
Re: EVA4400/6400/8400 - more than 4gbps throughput per LUN possible?
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.
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.
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