To what degree does a backplane effect throughput?

I have 2 storage servers.

1 - SAS2 HBA and SAS2 backplane.

2 - SAS2 HBA and SAS1 backplane.

I'm presently copying files from #1 to #2 and was surprised to see 130mbs. I've never gotten that high copying files to server #1 (highest is barely 100mbs) but I would think the speed would be higher since it has an SAS2 backplane. Both HBAs are LSI 2005s, one is built into the MB and the other is an IBM 1015. Could it be the magic is all in the HBA and the backplane has nothing to do with it?

Could it be your network??

Both servers are plugged into the same switch and both have Supermicro MBs with the exact same intel chipsets so I don't think it's the network. Makes no sense to me.

Much more likely your network chipset and how it's attached to the system (pci slots everything is in).

SAS1 gives you 1200MB/sec, and SAS2 gives you 2400MB/sec, much much higher than your 130MB limit.

The things that will slow it down, is your actual drive speed, how you configured your raid, how metadata is stored on the filesystem ontop of raid. Or if your just going to a single disk, I would say 130MB is excellent.

Thank you, sir. That explains it perfectly.

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