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Re: Good default values for disk monitoring

From: Paul Theodoropoulos
Subject: Re: Good default values for disk monitoring
Date: Sun, 3 Jun 2018 17:10:29 -0700
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.0

It primarily depends upon your workload. What sorts of applications are you running on the server? Websites? Database? Email?  Is usage generally steady, or bursty?

You'll need to generate some metrics in order to find the best alerting point.  For disk IO, I'd recommend using iostat, and leave it running for an interval during which you'd feel comfortable that the machine has been under what might be peak or high(er) load. e.g.

iostat -hmy 60

will gather statistics for MB/s read/write for the last 60 seconds, repeatedly. Watch those values for a while (or go have a coffee and come back and examine the scrollback :) - then check what the values are.

To get the 'service time' data, you'd run iostat in 'extended statistics' mode:

iostat -hmxy 60

What you might then do is set the monit tests to 1.5x the highest value you saw, as a starting point. Obviously you don't want to be alerted all the time for otherwise-normal activity, so you can tune it higher/lower from there.

On 6/1/2018 22:42 PM, Teresa e Junior wrote:
Hello! I'm in the process of discovering Monit, and I am happy with the results so far!

I've set up a couple of rules already, but disk I/O is something I find very difficult to understand. Based on the examples I found in the wiki, I have the following rules:

check filesystem root with path /
  if read  rate > 1 MB/s for 30 cycles then alert
  if write rate > 1 MB/s for 30 cycles then alert
  if service time > 10 milliseconds for 3 times within 5 cycles then alert

I would like to know, please, what could be a recommended default value! For instance, I have a personal server in a VMware VPS, with an Intel Xeon E5-2650L v4 CPU, 1 GB RAM, and 20 GB of allocated storage on SSD.

Thank you for your attention!

Paul Theodoropoulos

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