I just tried to buy a pair of Sun's T2000 machines, and then discovered (very late) that the system specification doesn't match my requirements.
It's not the system itself that's the problem, but the peripheral connectivity - or rather lack of such.
In particular, the plan was to hook up a couple of 3120 SCSI arrays. Not everything wants a fancy raid array, and FC arrays (and associated HBAs) are pretty pricy anyway. In this case, I'm looking at raw spindles for database access, but also if you look at ZFS it wants plain drives - raid hardware just gets in the way. So the plan was to have 2 SCSI channels and mirror them.
This won't work in a T2000. There's only 1 free PCI-X slot (the internal SAS controller takes the other one), and the only supported SCSI HBA is single channel anyway. So at the present time you simply can't have more than a single SCSI chain on a T2000.
To say that this is annoying is an understatement. It also limits the usefulness of the T2000 for several other projects I have in the pipeline.
Now, I could use FC storage, because the T2000 does have PCI-E slots, and there are PCI-E fibre HBAs, so it would work, but you're looking at a 50% or so increase in cost, which I regard as unacceptable. (The cost differential is particularly bad in small configurations - as you push up it becomes much less pronounced.)
Ho hum. Time to construct a plan B.