Update on Power Consumption
Put everything together to ensure it works and loaded FreeNas 0.7.1 onto a USB stick.
With the power off (although the bios had the WOL wake on lan? option enabled) the thing was pulling
9 Watts. I notice the USB port was still getting power too.
BTW, I used something from Canadian Tire which is called a Blue Planet Energy Meter. It's like a kill-a-watt but was easier for me to obtain (and only $25). Not sure of the accuracy.
So, I unplugged the cdrom and booted up with no spinning disks. Only the TR 430w psu, motherboard w/ stock intel cooler and 4gb ram all at stock settings, and cheapo kingston 4GB USB stick, oh and the 120mm case fan. Power use at idle was
65 watts. Not the ultra low power system Tom would build at less than 25w but hey, I have a $20 psu and some reasonably high powered equipment running. Maybe later I can try undervolt settings.
Then, I added the 2 drives pulled from my 'gamer/everyday' system. They turned out to be Seagate LP 1Tb drives. Just tossed them in the case and plugged 'em in. Idle wattage at
72 W. Not bad. The peak during start-up was only
92W so I can easily live with a 220watt 80plus psu even after adding some proper storage. and allowing for capacitor degradation over time.
I'm really interested in this thing I stole from a sub mesa post in another thread.
In a raid-z arrays; all disks should be the same size. However, you can create multiple arrays and combine them all in one pool, so you get:
raidz (disk1 disk2 disk3 disk4)
raidz (disk5 disk6 disk7 disk8)
Now disks 1-4 could be 1TB disks and 5-8 could be 2TB disks. These two arrays are RAID0'ed for increased performance and can use capacities of array1+array2. It is like a RAID50. So this allows you to fix different size of drives; but you have them in badges and they have to be redundant arrays. They can vary in size that is no problem.
Since my aforementioned drives turned out to be LP model seagates I would like to buy a couple more of the 1 tb versions to make a proper zraid but, when expansion time comes, I would like to add some 2tb (or higher? at the time) to the array. Originally I had planned to dump the original array and go with the larger one but, with cool quiet LP drives I would just keep them.
So, I read the above quote to mean that I can have a zraid array with 4 x 1tb drives. Then later I add a zraid array with 4 x 2tb drives and these arrays can be striped like a Raid 50? I don't get it but I love the idea. Grab the striping benefits of speed whilst retaining the redundancy of zraid AND mixing up the drive sizes. Seems too good to be true.