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 [...]

Posted on June 3, 2011 at 12:02 pm by Brendan Gregg · Permalink · 2 Comments
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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 [...]

Posted on May 24, 2011 at 5:57 pm by Brendan Gregg · Permalink · 2 Comments
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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 [...]

Posted on May 18, 2011 at 9:28 am by Brendan Gregg · Permalink · 9 Comments
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