Friday Jun 04, 2010

Visualizing System Latency

Heat maps are a unique and powerful way to visualize latency data. Explaining the results, however, is an ongoing challenge.

Brendan Gregg, Oracle

When I/O latency is presented as a visual heat map, some intriguing and beautiful patterns can emerge. These patterns provide insight into how a system is actually performing and what kinds of latency end-user applications experience. Many characteristics seen in these patterns are still not understood, but so far their analysis is revealing systemic behaviors that were previously unknown.

continue reading in ACMQueue

Friday Jan 30, 2009

Storage News, JN 20, 2009: Assumptions, and the 7000 Series

Be careful of assumptions - "I had been working on fixing 6775211: mirror mounts use the zcred; should use caller's cr augmented w/ PRIV_SYS_MOUNT before the Xmas break. I had it down to unit testing and thanks to Nico Williams, I even had some great unit tests. I just ran out of time to work on the bug.

Well it jumped in priority from a P4 to a P2 and was impacting other engineers. So I thought it might be easy to dust off and finish. I was wrong..." - Tom Haynes

Sun Storage 7000 for Oracle- "Jeffrey T. Wright and Sridhar Ranganathan wrote an excellent whitepaper about the Sun Storage 7000 series for Oracle. It´s really worth a read for everybody thinking about databases on NAS: Sun Blueprint - Configuring Sun Storage 7000 Systems for Oracle Databases." - thanks, Joerg!

Sun Storage 7110 Unified Storage System - "The 7110 delivers a complete network storage solution with no hidden catches. Both NAS and IP SAN are supported, performance is very good, and Sun won't be beaten on value..." - PC Pro magazine

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