mount path "size on media" vs "total data written"

  • 31 May 2021
  • 2 replies

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What is the difference between “size on media” and total “data written”?



If i look at the commvault documentation i find this:

Size on Media:
Displays the size of all chunks of data stored in the media.

Total Data Written:
The size of the data that is stored on the media.

I don’t understand how it’s possible that “size on media” is larger than “total data written”



Best answer by Stuart Painter 31 May 2021, 15:18

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Thank you for the question.

There are various counters to show volumes of data, each representing slightly different items.

Application Size is size of protected data on the client

Data Written is volume of this data written to storage - after compression, dedupe, etc.

Index data is also written to media with each job, so total space consumed will be larger than data written.

Size on media is the total volume of all backup data, plus the index data and meta data for all the jobs on that media.




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