I had been juggling internal drives + a Thermaltake BlacX eSATA dock since early 2010. It's nice to have a lower power (no power when it's not in use!) backup like this, but there's no protection for the data. Power use was my main decision in not building a JBOD a couple years ago; I simply didn't want something running 24/7. unRAID has come to the rescue!
First server (Limelight):
OS at time of building: 4.6
CPU: AMD Sempron 140Motherboard: ASUS M4A785-M Micro ATXRAM: Kingston 2GBCase: Cooler Master 590Drive Cage(s): Icy Dock 5 in 3Drive Cage(s): Norco SS-500Drive Cage(s): Built in CM four slot cage
Power Supply: CORSAIR Builder Series CMPSU-500CX 500WSATA Expansion Card(s): SUPERMICRO AOC-SASLP-MV8 PCI Express x4 SAS SAS RAID ControllerCables: 18 inch
Fans: 2x Masscool SL-FD12025 120mm for the top (exhaust), one
Scythe S-FLEX SFF21E / 120mm 1,200rpm installed on the side panel (intake), then stock fans for the front (intake) and rear (exhaust).
Flash Drive: 2GB SanDisk Cruzer MicroUPS: APC BR1000GParity Drive: 2tb WD EARS (jumpered)
Data Drives: 2x 2tb WD EARX
Data Drives: 1x 2tb WD EADS
Data Drives: 7x 2tb WD EARS
Data Drives: 2x 2tb Samsung F4 Spinpoint (w/Japanese firmware)
Data Drives: 1x 2tb Seagate Barracuda
Total Drive Capacity: 26tb
Primary Use: Media, music, and general backup
Likes: Everything!
Dislikes: Difficulty in understanding the user shares settings
Add Ons Used: unMENU, preclear_disk, email notifications
I got these numbers via the UPS and its "LOAD" number listed on the front panel of the UPS. I think it's pretty accurate.
Boot (peak): 125W
Idle (avg): 75W (all drives spun down)
Light use (avg): 85W (streaming to one client)
Active (avg): 175W (parity check)
Second server (Subdivisions):
OS at time of building: 4.7
CPU: AMD Sempron 140Motherboard: BIOSTAR A760G M2+ Micro ATXRAM: Kingston 2GBCase: AZZA Helios 910Drive Cage(s): Icy Dock 5 in 3Drive Cage(s): 2x
SUPERMICRO CSE-M35T 5 in 3Power Supply: Corsair TX650SATA Expansion Card(s): SUPERMICRO AOC-SASLP-MV8 PCI Express x4 SAS RAID ControllerCables: 18 inch
Fans: Stock fans
Flash Drive: 2GB SanDisk Cruzer MicroUPS: APC BE550GParity Drive: 2tb Samsung F4 Spinpoint
Data Drives: 3x 1tb WD FALS
Data Drives: 1tb WD EADS
Data Drives: 4x Samsung F1 Spinpoint 1 TB
Data Drives: 2x 2tb WD EARX
Data Drives: 2x 2tb WD EADS
Data Drives: 1.5tb WD FAEX
Total Drive Capacity: 17.5tb
Primary Use: Torrent hosting and short term storage
Likes: Everything!
Dislikes: Old disks run a bit warmer than the other server
Add Ons Used: unMENU, preclear_disk
Third server (Freewill):
OS at time of building: 5.0-rc8
CPU: AMD Sempron 140Motherboard: BIOSTAR A760G M2+ Micro ATXRAM: Kingston 2GBCase: AZZA Helios 910Drive Cage(s): None yet.
Power Supply: Corsair HX650SATA Expansion Card(s): None
Cables: 18 inch
Fans: Stock fans
Flash Drive: 2GB SanDisk CruzerUPS: APC BE550GParity Drive: 3tb Seagate Barracuda
Data Drives: 2x 500GB Caviar Blue AAKS
Total Drive Capacity: 1tb
Primary Use: Testing out release 5
Likes: Everything!
Dislikes: Old disks run a bit warmer than the other servers
Add Ons Used: Simple Features, preclear_disk
Updated pic hosting, with options:
800 pixels1024 pixels1280 pixels1600 pixels1920 pixelsfull resHere's my network diagram:

I was more than a little apprehensive when it came time to flatten the 5.25" bay tabs on a brand new case.

I flattened all 24 of them so when the next cages are ready, I just install them and add the drives. No more trips to the garage and getting jiggy with a clamp.
I found an old USB header and removed the metal bracket that holds it against the back of the case. It's now plugged into one of the USB pin sets.
The 4 pin ATX cord is not quite long enough to go behind the mobo in that kick ass cable race between the bottom mobo panel and the side panel, so I ordered an extension:
Athena Power 12" 4-pin P4 12V Power Extension Cable (Female to Male). Along those lines, the PSU has plenty of SATA power plugs (five of them), but short on molex (not unexpected). I also ordered three of
Athena Power 15-pin SATA to Dual 4-Pin Molex Adapter.
The front panel wires are neatly bundled and fastened to the case with zip ties. The SATA cables are bundled as well, but I don't like how little movement they have.
I performed a low level format on the parity drive using HDDGURU. That took about 5 hours.
Second server build notes:
The components for this server were purchased by a friend, under my guidance. He's a Mac user, and wanted something more expandable and lower cost than his Drobo. He bought the parts, but couldn't wait for me to arrive and help assemble. He shorted out the PSU somehow, and got really afraid. I bought the case, mobo, ram, proc, and cage for $300. It sat in a spare room for a solid eight months before I decided to do something with it.
1) I think the SM cages are slightly larger in dimensions. It was a VERY tight fit for the first one (middle position), and very, VERY tight for the third cage.
2) The front trim piece on the AZZA Helios 910 had these crossbars that had to be removed because would it not reinstall with the new cages there.
3) The cages must have their power cables installed before slid into position. There is almost no room to insert them after the fact. Mine are against the motherboard wall, not the other.
4) The threaded holes on the side of the SM cage are optical drive mounting threads, NOT hard disk mounting threads.
Third server build notes:
I bought the motherboard, CPU, and RAM from another unRAID user. Already had the Intel NIC and a few old disks to use as data. Bought the case, flash drive, and UPS new. I wanted to work on cable management with this build more so than the others. So a modular PSU was needed. The original PSU was an OCZ ZT650 which had a super long 24 pin ATX cable. It easily went into the race behind the motherboard. The 4 pin cable needed an extension. When that arrived, I hooked everything up and the damn thing wouldn't power up. After swapping in the Antec PSU, everything worked fine. So the OCZ went back to amazon for a refund. A Corsair HX650 is on its way. Just a few days after completing preclear sequences everything is great. I like how Simple Features looks, but I think it will be a bit before updating the other servers to release 5.