IO Troubleshooting on Linux

Article ID:115003461772
1 minute readKnowledge base

Symptoms

  • I have found evidences of IO issues in a Linux File System where Jenkins Home is hosted.

Diagnostic/Treatment

Pre-condition: You get the output from testIO.sh as explained in Required Data: IO.

The aim of this guide is providing minimum values for representative file sizes (and times) to consider a File System as healthy.

Write test

File Size Times Min Healthy Values

1K

10000

1 M/s

10K

1000

5 M/s

100K

1000

100 M/s

10M

100

100 M/s

50M

10

100 M/s

100M

10

100 M/s

Write/Read test

Minimum values for Write/Read are approximately the half of the listed ones in the Write test table. Please note that server throughput and latency time depends upon instance’s load as well. Ideally to get acquainted with your system, we recommend that you run execute testIO.sh after rebooting the instance as well as at peak load to get an idea about how the load is impacting its throughput.