We are hosting illumos and ZFS day events in San Francisco October 1 - 3, 2012. Our good friends from DDRdrive, Delphix, Joyent, and Nexenta are also sponsoring the event. I will be talking about how to optimize the design of ZFS-based systems and explain how to get the best bang for your buck. Jason and Garrett are also on the speakers list, talking about how illumos has really taken hold as a foundation for building modern businesses.
When I originally wrote cifssvrtop (top for CIFS servers), all of the systems I tested with had one thing in common: the workstations (clients) had names. Interestingly, I recently found a case where the workstations are not named, so the results were less useful than normal.2012 Sep 11 23:50:48, load: 3.11, read: 0 KB, write: 176448 KB
Modern systems are continuing to evolve and become more tolerant to failures. For many systems today, a simple performance or availability analysis does not reveal how well a system will operate when in a degraded mode. A performability analysis can help answer these questions for complex systems.
A legacy view of system performance is that bigger I/O is better than smaller I/O. This has led many to worry about things like "jumbo" frames for Ethernet or setting the maximum I/O size for SANs. Is this worry justified? Let's take a look...This post is the second in a series looking at the use and misuse of IOPS for storage system performance analysis or specification.
In case you missed the DTrace conference on April 3, 2012, Dierdre recorded all of the sessions and is publishing the videos. I had a few minutes to discuss the Aura Graph work that was demonstrated in Nexenta's booth at VMworld 2011. The short video explains what we were visualizing and why it is useful for operators.
Today, we routinely hear people carrying on about IOPS-this and IOPS-that. Mostly this seems to come from marketing people: 1.5 million IOPS-this, billion IOPS-that. Right off the bat, a billion IOPS is not hard to do, the metric lends itself rather well to parallelization...This post is the first in a series looking at the use and misuse of IOPS for storage system performance analysis or specification.