Delphix launch at DEMO

At 4:08pm today, we will launch Delphix Server at DEMO. At the presentation, Richard Rothschild from TiVo will describe how they have been using Delphix. TiVo, of course, has been canonized as technology that changes the way we live or work. My past work on DTrace was described by users as “TiVo for the kernel” [...]





Posted on September 14, 2010 at 9:35 pm by ahl · Permalink · Comments Closed
In: Delphix · Tagged with: , , , , ,

Leaving Oracle

I joined the Solaris Kernel Group in 2001 at what turned out to be a remarkable place and time for the industry. More by luck and intuition than by premonition, I found myself surrounded by superlative engineers working on revolutionary technologies that were the products of their own experience and imagination rather than managerial fiat. [...]





Posted on August 18, 2010 at 4:13 pm by ahl · Permalink · 40 Comments
In: Fishworks · Tagged with: , , ,

Fishworks history of SSDs

This year’s flash memory summit got me thinking about our use of SSDs over the years at Fishworks. The picture of our left is a visual history of SSD evals in rough chronological order from the oldest at the bottom to the newest at the top (including some that have yet to see the light [...]





Posted on August 17, 2010 at 2:25 pm by ahl · Permalink · Comments Closed
In: Fishworks · Tagged with: , , , , , ,

Farewell to Bryan Cantrill

I’ve been expecting this automated mail for a while now, but it was disheartening nonetheless: List: dtrace-discuss Member: bryan.cantrill@eng.sun.com Action: Subscription disabled. Reason: Excessive or fatal bounces. As one of the moderators of the DTrace discussion list, I see people subscribe and unsubscribe. Bryan has, of course, left Oracle and joined Joyent to be their [...]





Posted on August 12, 2010 at 4:33 pm by ahl · Permalink · 4 Comments
In: DTrace · Tagged with: , , , , ,

What is RAID-Z?

The mission of ZFS was to simplify storage and to construct an enterprise level of quality from volume components by building smarter software — indeed that notion is at the heart of the 7000 series. An important piece of that puzzle was eliminating the expensive RAID card used in traditional storage and replacing it with [...]





Posted on July 21, 2010 at 11:46 pm by ahl · Permalink · 8 Comments
In: ZFS · Tagged with: , , , , ,

Triple-Parity RAID-Z

Double-parity RAID, or RAID-6, is the de facto industry standard for storage; when I started talking about triple-parity RAID for ZFS earlier this year, the need wasn’t always immediately obvious. Double-parity RAID, of course, provides protection from up to two failures (data corruption or the whole drive) within a RAID stripe. The necessity of triple-parity [...]





Posted on July 21, 2009 at 11:48 pm by ahl · Permalink · 14 Comments
In: ZFS · Tagged with: , , , , , ,