iSCSI on OpenFiler, on a u320 controller/drive, over GigE:
Results 13.04System InfoXbench Version 1.3System Version 10.5.5 (9F33)Physical RAM 3072 MBModel MacBookPro4,1Drive Type OPNFILER VIRTUAL-DISKDisk Test 13.04Sequential 7.57Uncached Write 51.02 31.33 MB/sec [4K blocks]Uncached Write 47.33 26.78 MB/sec [256K blocks]Uncached Read 2.20 0.64 MB/sec [4K blocks]Uncached Read 30.68 15.42 MB/sec [256K blocks]Random 47.08Uncached Write 18.08 1.91 MB/sec [4K blocks]Uncached Write 87.45 28.00 MB/sec [256K blocks]Uncached Read 130.51 0.92 MB/sec [4K blocks]Uncached Read 94.66 17.56 MB/sec [256K blocks]
That's with an MTU of 1500. I can't seem to turn on jumbo frames on the OpenFiler box. I would speculate that jumbo frames would help out with sequential reads/writes significantly. I think perhaps there's a BIOS setting to enable/disable jumbo support but it's too late to fuck around with it much more.