https://community.dynatrace.com/t5/Open-Q-A/Measurement-of-Disk-Latency/m-p/37967#M1424 <P>when we looked at <STRONG>perform </STRONG>metrics there is a big difference as compared to the metrics reported by dynatrace .Can you please comment on that ?</P><BR /> Mon, 09 Dec 2019 20:53:09 GMT vaibhav_s_singh 2019-12-09T20:53:09Z https://community.dynatrace.com/t5/Open-Q-A/Measurement-of-Disk-Latency/m-p/37965#M1422 <P>From Frank: Do you know how disk<BR />latency is measured by Dynatrace? For example, does dynatrace measure direct or<BR />cached access? Ioping?</P> Wed, 28 Sep 2022 09:42:20 GMT https://community.dynatrace.com/t5/Open-Q-A/Measurement-of-Disk-Latency/m-p/37965#M1422 anton_goosen 2022-09-28T09:42:20Z https://community.dynatrace.com/t5/Open-Q-A/Measurement-of-Disk-Latency/m-p/37966#M1423 <P>Disk latency reporting depends on OS level metrics specific to Linux and Windows. The reporting is passive and reflects the load generated by the active applications. It is not a "benchmark" tool as ioping seems to be. It should not reflect OS disk cache or buffers but only actual "disk drive" I/O. Of course the drive itself may (actually always does) have a cache and such latency component would be included and averaged over. Also, if the drive is some kind of virtual drive (as is usually the case in VMs) then the latency is still reported from the point of view of the host (VM) OS and may not map directly into any physical hard drive latency.</P> Wed, 04 Oct 2017 13:53:30 GMT https://community.dynatrace.com/t5/Open-Q-A/Measurement-of-Disk-Latency/m-p/37966#M1423 Grzegorz_Pawelc 2017-10-04T13:53:30Z https://community.dynatrace.com/t5/Open-Q-A/Measurement-of-Disk-Latency/m-p/37967#M1424 <P>when we looked at <STRONG>perform </STRONG>metrics there is a big difference as compared to the metrics reported by dynatrace .Can you please comment on that ?</P><BR /> Mon, 09 Dec 2019 20:53:09 GMT https://community.dynatrace.com/t5/Open-Q-A/Measurement-of-Disk-Latency/m-p/37967#M1424 vaibhav_s_singh 2019-12-09T20:53:09Z https://community.dynatrace.com/t5/Open-Q-A/Measurement-of-Disk-Latency/m-p/37968#M1425 I'm not sure which metrics you mean? Do you refer to Windows Performance Monitor?<BR /> Tue, 10 Dec 2019 08:07:24 GMT https://community.dynatrace.com/t5/Open-Q-A/Measurement-of-Disk-Latency/m-p/37968#M1425 Grzegorz_Pawelc 2019-12-10T08:07:24Z