Articles by AURIMAS MIKALAUSKAS

Aligning IO on a hard disk RAID – the Benchmarks

In the first part of this article I have showed how I align IO, now I want to share results of the benchmark that I have been running to see how much benefit can we get from a proper IO alignment on a 4-disk RAID1+0 with 64k stripe element. I haven’t...

Aligning IO on a hard disk RAID – the Theory

By Aurimas Mikalauskas

Now that flash storage is becoming more popular, IO alignment question keeps popping up more often than it used to when all we had were rotating hard disk drives. I think the reason is very simple – when systems only had one bearing hard disk drive (HDD)...

Aspersa tools bit.ly download shortcuts

By Aurimas Mikalauskas

I use Aspersa tools a lot and I find myself going to the website just to download one of the tools all the time. I love I can download maatkit with a simple wget maatkit.org/get/tool command so I made bit.ly shortcuts for all of the current aspersa tools. Here’s...

Optimizing slow web pages with mk-query-digest

By Aurimas Mikalauskas

I don’t use many tools in my consulting practice but for the ones I do, I try to know them as best as I can. I’ve been using mk-query-digest for almost as long as it exists but it continues to surprise me in ways I couldn’t imagine it would....

Maatkit’s mk-query-digest filters

By Aurimas Mikalauskas

Have you ever seen BIG weird numbers in mk-query-digest report that just seem wrong? I have! Here’s one report I got today: ... # Attribute total min max avg 95% stddev median # ============ ======= ======= ======= ======= ======= ======= ======= # Exec...