Performance baseline
The OSD, including the journal, disks and the network throughput should each have a performance baseline to compare against. You can identify potential tuning opportunities by comparing the baseline performance data with the data from Ceph’s native tools.
Red Hat Enterprise Linux has many built-in tools, along with a plethora of open source community tools, available to help accomplish these tasks.
Reference
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For more details about some of the available tools, see this Knowledge base article.