Disk issues

There are two kinds of disk issues that NetScaler administrators may come across:

• Disk hardware issues: There are three ways to identify disk hardware issues:

  • SNMP Alerts is one way to identify it. You can configure the alarm HARD-DISK-DRIVE-ERRORS

  • Look for entries in the /var/log/messages file – the keyword is TIMEOUT

    

  • Run the hardware analysis file /netscaler/ns_hw_err.bash, which will run through all the log files and capture the TIMEOUT entries for you.

  Note

  Note that a very occasional TIMEOUT can occur with a perfectly healthy NetScaler. There is, however, a problem if you see a few of them in succession and that is the symptom you are looking for. RMAs can involve either simply replacing the SSD, which is less disruptive, or sometimes replacing the unit, if it's the controller which is failing (which is a lot rarer).

• Disk space issues: NetScaler relies on the hard disk not just for storing logs and traces, but also as swap space to improve performance. Consequently, when the...