How to Compare File System IO to ZFS Pool and Device Level
(Doc ID 1402953.1)
Last updated on MARCH 12, 2021
Oracle Communications Messaging Server - Version 6.0.0 and later Oracle Solaris on SPARC (64-bit) Oracle Solaris on x86-64 (64-bit)
***Checked for relevance on 21-Apr-2014***
When separate ZFS pools are used for each type of file system used by Messaging Server, you can monitor the IO statistics with the zpool iostat command. But customers often do not configure it that way. More often they create one pool and put all the file systems in that pool. (Or, worse yet, everything in one file system in the one pool.) The iostat command only shows the overall IO activity for the devices that comprise the pool. The zpool iostat command only shows the entire pool. How can you tell which file systems are involved in the highest IO activity?
This article provides an example script to gather statistics from your system and an example spread sheets to analyze that data. The script requires customization per your individual configuration. Another script is provided to extract data to a form that can be cut-n-pasted into the the spreadsheet.
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