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https://issues.apache.org/jira/browse/GEODE-4658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16400779#comment-16400779
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Kirk Lund commented on GEODE-4658:
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The two requested metrics already exist on the DiskStoreMXBean.

The show metrics command for category "diskstore" should be modified to expose 
these two metrics for as many contexts as possible:
* getDiskWritesAvgLatency() provides the average write latency to disk
* getTotalBytesOnDisk() provides the total bytes on disk

I think all of the work is specific to ShowMetricsCommand.java and its tests.

> Expose how much time it takes to write to disk and what is the disk store size
> ------------------------------------------------------------------------------
>
>                 Key: GEODE-4658
>                 URL: https://issues.apache.org/jira/browse/GEODE-4658
>             Project: Geode
>          Issue Type: Improvement
>          Components: docs, gfsh
>            Reporter: Fred Krone
>            Priority: Major
>              Labels: starter++
>
> *Given* I have a persistent region with a default disk store
>  *When* I write data on the region
>  *Then* I can see  2 new metrics {{average write time to disk}} ns time and 
> {{size of disk store}} in bytes
> h3. Documentation
> Add this new metric to the docs
>  
> This should be a matter of altering the ShowMetricsCommand.java 



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