Just a quick post to address something many people either get wrong or just live with due to convenience.
In summary: Please, let’s stop using average I/O sizes to characterize storage system performance. It’s wrong and doesn’t describe how the real world works. Using an average number is as bad as using small block 100% read numbers shown in vanity benchmarks. Neither is representative of real life.
Using a single I/O size for benchmarking became a practice for a vanity benchmark and to provide a level playing field to compare multiple products.
But, ultimately, even though the goal of comparing different systems is desirable, using a single I/O size is fundamentally flawed.
Continue reading “Why it is Incorrect to use Average Block Size for Storage Performance Benchmarking”
I normally deal with different aspects of storage (arguably far more exciting) but I thought I would write something to provide some common sense perspective on the current state of 7-Mode to cDOT adoption.
I will tackle the following topics:
- cDOT vs 7-Mode capabilities
- Claims that not enough customers are moving to cDOT
- 7-Mode to cDOT transition is seen by some as difficult and expensive
- Some argue it might make sense to look at competitors and move to those instead
- What programs and tools are offered by NetApp to make transition easy and quick
- Migrating from competitors to cDOT
Continue reading “7-Mode to Clustered ONTAP Transition”
Ah, nothing to bring joy to the holidays like a bit of good old-fashioned sales craziness.
Recently we started seeing weird performance “guarantees” by some storage vendors, who seem will try anything for a sale.
Probably by people that haven’t read this.
It goes a bit like this:
Continue reading “Beware of storage performance guarantees”
Kind of a long hiatus posting (far too busy working on cool stuff) and for you looking for a deep technical post this may not be it… but here goes anyway since the content may also apply to my more usual subjects.
Recently I decided to discard my Luddite membership card and join the hordes of people using network-based services for music.
Continue reading “Is convenience devaluing products? Does quality suffer because of it?”
It was with interest that I watched some of EMC’s announcements during EMC World. Partly due to competitor awareness, and partly due to being an irrepressible nerd, hoping for something really cool.
BTW: Thanks to Mark Kulacz for assisting with the proof points. Mark, as much as it pains me to admit so, is quite possibly an even bigger nerd than I am.
So… EMC did deliver something. A demo of the possible successor to VNX (VNX2?), unavailable as of this writing (indeed, a lot of fuss was made about it being lab only etc).
Continue reading “How to decipher EMC’s new VNX pre-announcement and look behind the marketing.”