I’m in MN prepping to teach a course (my signature anti-FUD extravaganza), and thought I’d get a few things off my chest that I’ve been meaning to write about for a while. Some Stravinsky to provide the vibes and I’m good to go. It’s getting really late BTW and I’m sure this will progressively get less coherent as time goes by, but I like to write my posts in one shot.
NetApp disk rebuild impact on performance (or lack thereof)
Due to the craziness in the previous blog, I decided to post an actual graph showing a NetApp system I/O latency while under load and a disk rebuild. It was a bakeoff vs another large storage vendor (which NetApp won).
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What if you could dramatically improve your application testing times? What would happen to your productivity and to the company’s bottom line?
So, let’s say the DBA (or insert some other discipline) wants to do some testing for a new product (known to happen occasionally) – and the way he would really like to test is to create 20 test cases, which requires 20 copies of the main database. He would then automate the test and therefore get results very quickly.
New ext4 vs XFS benchmarks using Fedora 11 Leonidas
What a difference a kernel rev and/or distribution make. If you recall from a previous post, I was unable to complete postmark testing on Ubuntu 9.04 using ext4, and had to recommend against ext4. Now, with the release of Fedora 11 “Leonidas”, a new kernel seems to make a big difference in performance and stability of ext4.
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Linux filesystem benchmark extravaganza – including Deadline vs CFQ schedulers and ext4 instability
I have some spare time these days so I figured I’d finally test as many filesystems on Linux as I could…
The new ext4 is an option with modern kernels so I loaded Ubuntu 9.04 and tried postmark and bonnie++ on the same partition using various filesystems and switching between the CFQ and Deadline schedulers.