I really try to avoid blogs-about-blogs (BAB - I just made that up), but there was an interesting post over on DrunkenData that discusses how physical storage size relates to final logical storage size on a NetApp box after a variety of techniques are used, such as RAID, snapshot, etc. There is some odd disagreement on that site about whether NetApp is cheating their customers by wasting a bunch of physical storage.

For example, one of the complaints is that a RAID-6, or RAID-DP in NetApp terms, eliminates two drives worth of storage. A 6-drive RAID-6 has a 67% effective usage due to those two drives being used for data protection. Duh. That’s pretty much the way RAID-6 works. You can’t do anything about it.

Anyway, the post is here if you want to read it. Look for my comments.

TT

This entry was posted on Wednesday, October 25th, 2006 and is filed under Storage Interconnects & RAID, Advisor - Tom Treadway. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.