On 9/02/2015 23:50, SebA wrote:
Hi Adam, We are using Cambridge University's DRBD Xymon script from here: http://www.ch.cam.ac.uk/computing/drbd-xymon-script It works well for status colours, but it does not do graphing as far as I know. Output is simple, like this:
Mon Feb 9 12:46:14 2015 - drbd OKversion: 8.3.10 (api:88/proto:86-96) green cluster_metadata [/dev/drbd0] is happy green vg0_drbd [/dev/drbd1] is happy While this script is probably very useful, it seems to make three calls to the command drbdadm for each resource, while you could simply read all of the information from /proc/drbd without a single external program call. (would also mean you don't need sudo access).
Which is probably just as well, as I wouldn't know what dw was! What is it, and why should we be monitoring it?
dw is for Disk Write, dr is Disk Read, etc, these graphs can show you how busy your DRBD devices are. Some of the other stats will show how much data is sent/received to/from the DRBD peer, also, how often the data is outside of the active DRBD area (which might assist with tuning DRBD for better performance but increasing the size of the active area, or splitting your DRBD into multiple parts), etc.
You can see the full meaning of each statistic at: https://drbd.linbit.com/users-guide/ch-admin.html
Of course, I'm not trying to convince you that my script/work is any better or more reliable than what you are using, I didn't know that script even existed. I am hoping that either my script will be helpful to somebody else, and/or that someone might find a problem or improvement to my script and share that.
Regards, Adam