Hi Robotbeat,Originally Posted by Robotbeat
I finished a huge battery of tests using different test file sizes for comparison. For very small test file sizes (10MB and 40MB) with 4k random writes, fibre channel outperforms iscsi up to 80 times!
there must be something wrong with your setup. look at my results:
Our DSS is a dual XEON 3,2 GHz, 8 GB RAM, ARC 1280 - 2GB, using block-IO and 1GB iSCSI connections.
We run 4 1TB SATA drives in Raid 10 configuration, in total 5 volumes with 10 TB.
This is no test setup, so we have some load (21 ESX Servers, 136 VMs, 44 SAP Test Servers) on this DSS - the values may be not exactly reproducable.
As you can see, our old and busy setup beats your FC DSS easily in higher file sizes.
It seems to be more constant compared to your very high values with low file sizes and low values at high file sizes.
We actually have no issues with bad performance using iSCSI and block-IO. Its not fast as hell but it is very acceptable with high load.
Best Regards,
Lutz
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