Performance comparison IBM v3700 vs HP MSA 2040

Hi
I am looking to upgrade an HP VSA virtual storage solution to either IBM v3700 or HP MSA 2040.
In both configurations, the machine comes with 24 * 900 GB 10K SAS drives.
I have 3 hosts that will need to connect ( vMWare essential ) , and was thinking to connect with 2 SAS each host.
Some people say it is better to connect with Fiber Channel for higher IOPS, is that true?

The system will run +-10 virtual machines, from wich 2 SQL , one Exchange 2010 and then file servers, DC etc...

Pros/cons for each one please
Jaime
LVL 2
GreatSolutionsC.I.OAsked:
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David Johnson, CD, MVPOwnerCommented:
10Ge is as good as fibre  .. use fibre for distance not speed.
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Will SAS HBAs and storage be 6Gbps or 12Gbps SAS?

We only deploy clusters on DAS setups (currently 6Gbps SAS with 12Gbps PoCs starting soon).

With three nodes, dual 6Gbps SAS HBAs, and MPIO you have an aggregate of 144Gbps of ultra-low latency bandwidth at your disposal. In our testing a single node's dual 6Gbps SAS HBAs with a single SAS cable per HBA saturates at 377K IOPS (24 SAS SSDs in a 24 bay 2U JBOD).

Current Ethernet and other storage fabrics really can't touch that.

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andyalderSaggar maker's framemakerCommented:
Just working out Philip's 144Gbps...

3 * 2 * 6 = 36, 36*4=144 - no explanation of where that multiple of 4 comes from though. It's because those SAS connectors have 4 lanes in them so a 6Gb SAS connection with a wide (4 lane) port is actually 24Gb bandwidth.
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Philip ElderTechnical Architect - HA/Compute/StorageCommented:
6Gbps SAS = 48Gpbs of low latency bandwidth for a dual 6Gbps SAS HBA node configuration. In a three node configuration the aggregate bandwidth across three nodes would be 144Gbps.

Microsoft has a PoC document out there on a 3 node single JBOD configuration hitting 1M IOPS. Our 1 node 1 JBOD setup hit 377K IOPS as mentioned so we were in line with hitting the Microsoft mark when business took over. :)
andyalderSaggar maker's framemakerCommented:
Only because there are 4 lanes per connector plug, you should have mentioned that since most people assume that 6Gb SAS gives you a 6Gb connection.
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
Good point. I've been working with it so long that it is taken for granted. Thanks for pointing that out. I'll make sure to break that out in further explanations.
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