I find it interesting that this only came up when I wrote something pro-NetApp. Wasn’t even anti-EMC.
Before all the variable-block aficionados go up in arms, I freely admit variable-block deduplication may overall squeeze more dedupe out of your data.
I won’t go into a laborious explanation of variable vs fixed, but, in a nutshell, fixed-block deduplication means that data is split into equal chunks, each chunk given a signature, compared to a DB and the common chunks are not stored.
Due to the craziness in the previous blog, I decided to post an actual graph showing a NetApp system I/O latency while under load and a disk rebuild. It was a bakeoff vs another large storage vendor (which NetApp won).
I’m all for a good fight, but in the storage industry it seems that all too many creative liberties are taken when competing.
Let’s assume, for a moment, that we’re talking about the car industry instead. I like cars, and I love car analogies. So we’ll use that, and it illustrates the absurdity really well.