Supermicro 836 - cracking case, I'm using two of them at our place now.

If you're after a Solaris compatible motherboard, the H8DM3-2 is on the HCL and 
I've got one running OpenSolaris at the moment.  Check this supermicro page if 
you want to see if it fits the 936:
http://www.supermicro.com/aplus/motherboard/Opteron2000/MCP55/H8DM3-2.cfm

Regarding the configuration, I'd personally set up 8 mirrors on the raid cards, 
and stripe them in ZFS.  Your rebuild times will be horrendous otherwise - 
rebuilding 8TB of data if a single disk fails... not good!  I'm also having 
problems at the moment with hot swap and ZFS, so letting the raid hardware deal 
with that may not be a bad idea.

You also say $2,200 for a 'few' drives.  Bear in mind that if you use ZFS for 
raid-z or raid-z2 (definately recommended for the error correction btw, even 
with hardware raid!) you can't expand a raid array in ZFS.  You're either 
talking about restoring from a backup, or breaking the mirrors, creating new 
stripes and hoping no disks fail as you re-sync.  Either way it's going to be 
painful.  

You could just stripe the mirrors in ZFS, but bear in mind you then have no 
protection if ZFS finds data errors.  Also, while you can add disks to a 
stripe, in time your performance will suffer:  as you expand, some data will be 
striped over just a few drives instead of all of them, and it'll get worse as 
the disks get full.

I can't say about the adaptec drivers, I'd check the Solaris HCL. I think I've 
heard 3ware and Arcea mentioned on the forums, and I've heard good things about 
Areca.
http://www.sun.com/bigadmin/hcl/

And yeah, the Thumpers are great, but not quite comparable to the NetApp for 
features yet.  About 3x better on price and performance though... :D

Ross
 
 
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