Why do some data storage solutions perform better than others? What tradeoffs are made for economy and how do they affect the system as a whole? These questions can be puzzling, but there are core truths that are difficult to avoid. Mechanical disk drives can only move a certain amount of data. RAM caching can improve performance, but only until it runs out. I/O channels can be … [Read more...] about The Four Horsemen of Storage System Performance: Get Smart
VMware’s introduced the “vStorage APIs for Array Integration” (VAAI) in vSphere 4.1, and block-heads like me went nuts. We’ve been trying to integrate storage and servers for decades, and VMware’s APIs finally allowed this to work in truly seamless fashion. But the world of VAAI is a thicket of bizarre naming and puzzling functionality. Some VAAI primitives are ignored or even … [Read more...] about A Complete List of VMware VAAI Primitives
Upgrades are an inevitability in our modern technological world. A new phone comes out every year or two, and the migration process begins. So why don't devices have a special mode, priming them for upgrade and migration? This really hit home recently, as I upgraded the hard disks in my Drobo, but it applies equally to laptops, phones, and services like e-mail. So It … [Read more...] about Why Can’t We Prime Our Devices For Upgrades?
If WRITE_SAME can be a semaphore for thin un-provisioning, what about TRIM? It sounds like a perfect fit, and has wider implementation to boot! Let's take a deeper look. First, I'd like to remind the reader that I'm not some specialist storage engineer. I am regular guy who wanted to know about this TRIM thing. I welcome corrections and feedback on this piece! We … [Read more...] about Is TRIM Useful For Thin Provisioning?
Prognostication is a perilous business, but pundits are drawn to the topic in the month of December. The fact that most predictions fall on their faces demonstrates the intoxicating mix of hope, dreams, and irrationality that mark both geniuses and fools. I am neither, so I like to make predictions after the fact! But this year I've been asked to look to the future, so I'll … [Read more...] about Eleven Tech Trends To Watch In 2011