Enhancing the Size Calculator

Adam Leventhal produced a really useful tool shortly after we launched the 7000 series which, in combination with our Storage VM would allow the user to see the usable capacity of various hardware configurations.  You can read Adam's original blog entry here.  The tool is fantastic, and I use it all the time, but the usable capacities were in raw TB, as reported by the drive manufacturer, which is not what the 7410 sees... You may have run across this with your own PC when you bought that shiny new 1TB drive and powered up the machine to find your OS asking you to format 931GB.

When I used the tool, I found myself manually converting the usable capacity into binary to find the true usable capacity.  With a little effort, I collaborated with Adam to enhance the tool to show a new column that gives the true usable capacity in binary and account for a small filesystem metadata reserve that the 7410 will hold back.  The resulting tool can be downloaded here. Of course, for the 7110 and 7210, you can continue to use the tables posted on the 7000 Series wiki here

For anyone who cares to know the difference between a base 10 TB and a base 2 TB (labeled in the updated tool as TiB):

One TB (as described by disk manufacturers) is 1000 to the 4th power, or 1,000,000,000,000 bytes
One TiB is 1024 to the 4th power, or 1,099,511,627,776 bytes

Update: The size calculator is currently unavailable. For more detail see here

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This is the weblog for Ryan Matthews, a sales consultant at Oracle specializing in the ZFS Storage Appliance. It is the home to information on sizing and much more.

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