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Most people who build custom home servers will be able to articulate the cost per GB (cost/GB) of their drives. Yet this is a somewhat outdated metric. The major cost consideration that a lot of people overlook is port costs. Simply put, this is the cost to connect a hard drive to the system. For normal computer users this is often in the sub-$5 per port since they have open SATA connectors on their motherboards and open spots in their case making the cost of adding a drive the cost of a SATA cable. Home servers are a different story all together. A quick audit of the Big WHS showed that my port costs were approximately $46/ port. Compared to the $70 going price of a 1TB drive, this can be a huge portion of costs and is certainly appropriate to add to the cost/GB  equation.

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Just as an update. I installed the second Adaptec 31605 today, filling all 16 ports with 8x WD Greens, 6x Hitachi 2TB, and 2x Hitachi 1TB drives. There is an additional 1.5TB Seagate 7200.11 being used as an OS drive. That’s 27.5TiB raw capacity.

Here’s a view of all the drives currently in The Big WHS. Note, I may have killed yet another WD Green. A single SMART error so I’m making quadruple sure that something isn’t wrong.

17 Drives, 27.5TiB Raw installed for testing

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Just as a note to anyone running multiple large disks in Raid 6 for Windows Home Server. I was setting up new Raid 6 arrays on the WHS this weekend, controlled by an Adaptec 31605 and was greeted by a nice error message. WHS is limited to four volumes per physical drive using basic discs. A quick search of the Adaptec site showed the problem and a proposed fix, dynamic disks. While this would be great under normal circumstances, WHS does not play well with dynamic disks.

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Just to check some additional 15k rpm SAS numbers, I used three Seagate Cheetah 15k.5 300GB drives in Raid 5 to see what the numbers would look like. The drives are 3.5″ form factor units so they run quite a bit warmer than the 15k.1 2.5″ Savvios that are also in this machine. First the chart:

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