Everyone else should be using the Intel X25-E.  There's a massive difference 
between the M and E models, and for a slog it's IOPS and low latency that you 
need.  

I've heard that Sun use X25-E's, but I'm sure that original reports had them 
using STEC.  I have a feeling the 2nd generation X25-E's are going to give STEC 
a run for their money though.  If I were you, I'd see if you can get your hands 
on an X25-E for evaluation purposes.

Also, if you're just running NFS over gigabit ethernet, a single X25-E may be 
enough, but at around 90MB/s sustained performance for each, you might need to 
stripe a few of them to match the speeds your Thumper is capable of.

We're not running an x4500, but we were lucky enough to get our hands on some 
PCI 512MB nvram cards a while back, and I can confirm they make a huge 
difference to NFS speeds - for our purposes they're identical to ramdisk slog 
performance.
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