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Read / Write performance on XRaid


I've been working with a couple of smaller XRaid systems with and without XSan, and my empirical observation is that introducing XSan slows down data access quite a bit, at least in our use cases. I'm guess I'm wondering about the conflict between this piece of marketing from apple.com/xserve/raid/performance.html:

Finely tuned, Independent Motors
The advanced Xserve RAID architecture delivers fast access to storage without compromising data integrity. Dual independent RAID controllers provide protected storage with unprecedented performance. In fact, Xserve RAID boasts a throughput of over 380MB/s, fast enough to support real-time, uncompressed, high-definition (HD) and multiple- stream (SD) video editing without dropping a frame:

And this recent post:

The actual throughput on the FC controller on the XServe RAID is somewhere around 80MB/s?

Is it XSan, or some other factor, that introduces the 80MB/s limitation per controller on the XRaid?

My observation is that read / writes are considerably faster on a directly mounted XRaid than on one made available through XSan, all else being basically equal. Obviously, XSan scales where direct mounts do not, but is there really a factor of >2 performance hit on for very small SANs?

-Chris Dwan
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