Monitor disk health linux serial#
Monitor disk health linux Offline#

The number of milliseconds spent servicing requests, from beginning to end, including queue time and the time the device actually takes to fulfil the request. Let us see what they mean and its importance. The most crucial parameters on this result are svctm %util.

The disk details alone can be obtained by using the switch “ -d “

The second portion of the output explains the IO activities for various disks attached to the server.This can be used in Linux disk health check. On the above example, we can assume that 7.94 % of total IO requests are in the queue while 59.54% of CPU clocks are idle. A high value here indicates that CPU is not busy. The %idle parameter indicates the CPU idle time. Ī high iowait on this section indicates that CPU is incapable of handling all incoming requests and hence the requests are held in queue indicating a degraded performance. So we are focusing on the most crucial one is %iowait and %idle in avg-cpu performance output. You can get the CPU performance alone using the following command iostat -c. Let us focus on the core valuesĪs you can see from the result the avg-cpu part explains the IO activities for the CPU. Linux 2.6.0.8.58 Monday 04 June 2012Īvg-cpu: %user %nice %system %iowait %steal %idleĭevice: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util So I am focusing on the values which need to be monitored during a suspected server issue.Ī sample IOSTAT output will look like this The details regarding the various parameters will make this article quite confusing. To do this, open the configuration file “/etc/default/smartmontools” and uncomment the line #start_smartd=yes (remove the #).Iostat (input/output statistics) a utility that reports Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions.It can be used for the linux disk health check and it is quite handy to identify which partition is being heavily used and if any HW issues exist. On Debian and Ubuntu systems, smartd-runner executes other actions in addition to the mail (-m) option.įor more information, check out the nf man pages.Īfter configuring smartd, we have to ensure that it starts up on system start.

-M exec /usr/share/smartmontools/smartd-runner: This modifies the behaviour of the -m flag.

Note that this requires a working email set up on the system

-m root: Send a mail to the address specified (root here).

This sample indicates a short test at 2:00 A.M daily and a long test every Saturday at 3:00 A.M.

Monitor disk health linux Offline#

-o on: Enables SMART Automatic offline testing.You can add it later if smartd fails to start.

If you didn’t, try leaving it out initially. If you had to add a -d TYPE parameter to the smartctl commands, you’ll almost certainly have to do the same here.

Monitor disk health linux serial#

-d sat: On my system, smartctl correctly guesses that I have a serial ATA drive.

The options above indicate the following situations: 6 /03 ) -m root -M exec /usr /share /smartmontools /smartd-runner