Wednesday, 10 December 2008

Storage Waterfall Revisited

A while back I presented a diagram showing how storage is lost throughout the provisioning process.

I've added a few more items onto the diagram and heres version 2. The additions show reasons why storage is lost at various points in the cycle, for example, disks not not in use, hot spares, not using all the remaining space on the disk etc.

If anyone has additional reasons I've missed, then please let me know.

The next step is to look at ways of retrieving this storage and improving efficiency.


John Fullbright said...

Let's not forget that drive manufacturers state capacity in base 10 terms and storage vendors state them in base 2 terms. To a drive manufacturer, 1GB is 1,000,000,000 bytes; to a storage vendor, 1GB is 1,073,741,824 bytes. That's about a 7.4% difference right there before we even consider anything else.

Chris M Evans said...


Great one, thanks! Shame this is one we can't do anything about. :-(

Pete said...

Amazing! Reminds me of the power consumption "food chain" and how much power is lost before it even gets to PCs, servers and storage systems.

How about comparing contrasting these two waterfalls?