File System Latency: part 5
This is part 5 of File System Latency, a series on storage I/O performance from the application perspective (see parts 1, 2, 3 and 4). Previously I explained why disk I/O metrics may not reflect application performance, and how some file system issues may be invisible at the disk I/O level. I then showed how [...]
In: Performance · Tagged with: cloud analytics, dtrace, filesystem, latency, mysql, performance, vfsstat
File System Latency: part 4
This is part 4 on file system latency, a series on storage I/O performance from the application perspective (see part 1, part 2 and part 3). In the previous post I showed how to trace file system latency from within MySQL using the pid provider. In this post I’ll show how similar data can be [...]
In: Performance · Tagged with: dtrace, filesystem, latency, mysql, performance
File System Latency: part 3
This is part 3 on file system latency, a series on storage I/O performance from the application perspective (see part 1 and part 2). Here I’ll show how to actually measure file system I/O latency – the time spent waiting on the file system to complete I/O. Examining this can save a lot of time [...]
In: Performance · Tagged with: dtrace, filesystem, latency, mysql, performance
