# Performance analyzer IO\_ReadSyscallRate and IO\_WriteSyscallRate metrics **URL:** \ **Category:** Performance Analyzer\ **Tags:** discuss\ **Created:** [May 1, 2023, 5:06pm UTC](https://forum.opensearch.org/t/performance-analyzer-io-readsyscallrate-and-io-writesyscallrate-metrics/14146 "2023-05-01T17:06:11Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Knight](https://avatars.discourse-cdn.com/v4/letter/k/2bfe46/32.png) [@Knight](https://forum.opensearch.org/u/Knight)\ **Post date:** [May 1, 2023, 5:06pm UTC](https://forum.opensearch.org/t/performance-analyzer-io-readsyscallrate-and-io-writesyscallrate-metrics/14146/1 "2023-05-01T17:06:11Z")
**Versions** (relevant - OpenSearch/Dashboard/Server OS/Browser): 2.4 **Describe the issue** : Hello All, We are exploring using performance analyzer for developing metrics across our fleet of Opensearch clusters. We’ve setup a three node cluster and were able to bring up the cluster and performance analyzer. While going through the documentation for performance analyzer I see “IO\_ReadSyscallRate” and “IO\_WriteSyscallRate” and it says “system calls per second” specifically in the description. I would like to know if this metric is specific to reads/writes requests made to Opensearch cluster or will it include all the calls made to the operating system kernel. Thanks in advance! **Configuration** : **Relevant Logs or Screenshots** : ---
**Author:** ![system](https://us1.discourse-cdn.com/flex019/uploads/mauve_hedgehog/original/2X/3/33547ea01a5b12dcca2958411d3edd97ae2ea8c1.png) [@system](https://forum.opensearch.org/u/system)\ **Post date:** [June 30, 2023, 5:06pm UTC](https://forum.opensearch.org/t/performance-analyzer-io-readsyscallrate-and-io-writesyscallrate-metrics/14146/2 "2023-06-30T17:06:30Z")
This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.