Depends on the kind of IO really. A 100MB file is probably going to move around faster on the local SAS disks then on the massive RAID 5 group of 14 disks.
But a 35GB file would probably scream on the SAN in comparison.
I didn't think about that, I'm pretty new to the storage world. I ran a test to compare file size performance
When I use a 100MB test file, my local SAS is about 50% faster for random reads!!
When I use a 1GB test file, my SAN is 1000% faster for random reads (in IOs/Sec)!!
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I bet your san has a couple gig cache and your local box might not, so you're seeing the cache drop-off going from 100M to 1G.
Okay, so when we get outside of cache limits, I am getting about 3 times faster on my SAN than on the local disk. That sounds about like what I would expect. Thanks for the hints on proper benchmarking.