mirror

Add a Mirror to an Existing ZFS Drive

December 11, 2017 By Stephen 9 Comments

I recently added a mirror to a very simple zfs pool and decided to document it here for posterity. This worked flawlessly in a FreeNAS 10 system with two 4 TB drives.

VMware VAAI Storage Array Support in Plain English

February 8, 2011 By Stephen 18 Comments

The most exciting enhancements in VMware vSphere 4.1 is the addition of vStorage API for Array Integration (VAAI). This new API allows VMware ESX to offload storage processing functions to capable storage arrays, reducing the workload on the server hardware in introducing new and exciting possibilities for performance and efficiency. VAAI in ESX 4.1 includes three separate capabilities: block zeroing, full copy, and hardware assisted locking.

GPS Time Rollover Failures Keep Happening (But They’re Almost Done)

This is week “1111111111” in the GPS system. Tomorrow morning it will roll over to week “0000000000”. How well will various systems handle this change? Not well, judging by what we’ve seen so far!

Ranting and Raving About the 2018 iPad Pro

I remain enthusiastic about the iPad Pro, despite getting a scratched screen and my concerns about durability. It’s a worthy successor to the original and offers enough improvements that I’d recommend the upgrade for just about anyone who uses their iPad for serious work. It’s still not yet a laptop replacement, but this is due more to a lack of desktop-class software for iOS than anything in Apple’s control.

United Boeing 787 Dreamliner: Butt-In-Seat Economy Plus Review!

November 13, 2012

Most of my readers know that I love getting my hands on the latest high-tech products. But, last week, I spent a few hours insideï»¿ one of the latest and greatest products on earth: United’s latest Boeing 787 “Dreamliner” composite jet! Here’s my “butt-in-seat” review!

The Four Horsemen of Storage System Performance: The Rule of Spindles

August 25, 2010

Why do some data storage solutions perform better than others? Mechanical performance, RAM caching, I/O capacity, and the intelligence of the system all have a part to play. Today we examine the rule of spindles: Adding more disk spindles is generally more effective than using faster spindles.

SMB 3 is Going to be Huge, in both Scope and Impact

May 6, 2012

Microsoft is about to release the third major revision to their ubiquitous network storage protocol, SMB. Windows Server 2012 and Hyper-V 3 will really highlight this technology, and I predict it will transform the way people think about networked storage for Windows systems. But SMB 3 is big in another way, too: there are tons of new features, and not all will be implemented by everyone.

Follow the Yellow Brick Road to the Software-Defined Future

November 29, 2012

The Software-Defined Datacenter is a great concept, but it just won’t work. The big enterprise companies will never allow VMware (and daddy EMC) to commoditize them out of existence, so useful implementations will be rarer than ruby slippers. The best we can hope for is point enhancements to enable greater virtual machine mobility through SDN and improved storage integration.

Not All 802.11n Networks Are Alike

July 2, 2011

Buyers of 802.11n wireless network equipment should not assume they will see a great benefit right out of the box. Most will have to enable by hand a high-performance configuration including wide channels and 5 GHz operation. And some client devices may never reach the levels of performance expected by consumers due to hardware limitations.

A High-Tech Water Heater? Yep! Introducing the A. O. Smith Vertex

November 15, 2012

I justify spending six times more on the Vertex 100 for a simple reason: It’ll keep up with the heavy water use in my house. I’m hoping I’ll never have to worry about hot water as long as I live here. The fact that it saves over $100 per year due to energy-efficient design is just icing on the cake.

Defining Failure: What Is MTTR, MTTF, and MTBF?

July 6, 2011

Most computer industry vendors use the term â€œMTBFâ€ rather indiscriminately. But IT pros know that systems do not magically repair themselves, at least not yet, so MTTR and MTTF are just as important!

How To Keep Your Family Activities In Sync With A Shared Google Calendar

April 18, 2010

Smartphones, computers, and iPads are proliferating in families today. Although my three kids do not (yet) have their own mobile phones, we still have quite a few devices with calendar functions: An iPhone each for me, my wife, and our au pair along with an iPad and a few computers. Using Google Calendar, we have set up an awesome shared calendar to keep all of our activities in sync. Read on for instructions!