In my windows servers, I'm monitoring a counter called "current disk queue length". Basically, accordingly with MS: "Current Disk Queue Length is the number of requests outstanding on the disk at the time the performance data is collected."

I like it because it's simple.

My question is, does linux has something like this counter?

I was looking into IOSTAT, but none of the counters provided seems to be equal to current disk queue lenght. The most similar is "avgqu-sz", but it's an average and the windows one is the actual value measured when the zabbix agent was contacted.

Please could you register a feature request? Meanwhile you can create a simple user parameter, which would parse output of /proc or vmstat.

So my request is to create an item that could monitor, either in windows and linux, the disk I/O. Something like vfs.dev.diskqueue[device].