This is in response to the question of the HDS 9960 EMC 8730 question. First of all the HDS 9960 has shared bus architecture on the channel side, so you tell me what it matters if you have a 100mb pipe in the inside of the box and you can't get the data out. Also explain HOW you got 165,000 I/Os a second out of the 9960. Can you get those numbers from a real world app? I think not.


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There are 32 100MB per second switched Fibre ports on the channel side of a 9960. Each of those channels can be shared up to 128 nodes per channel. The internal bandwidth of the 9960 is 6.4GBs, and uses a non-blocking crossbar switch. The cool thing about the 9960 is since it uses a non-blocking switch, you can add MANY more servers without getting the resource contention that would happen in a bus based architecture. This allows for extremely reliable consolidation of storage and servers, without the worry of one server impacting the performance of another. Hitachi has seen linear performance where IOPS increase as channels are added at a rate of around 5000 per channel (60,000 across 12 channels in a real world test using IOGEN and IOMETER)


This was first published in April 2001

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