Performance of Retro 8.1

[Henry M. Seiden]

No, David. The Media Set selection of drives, the definition of what to back up, doesn't vary. I noted instead the incremental file size/quantity (of the changed files). As you know, when the backup is run, and after Retro analysis, the selected number of files to be backed up varies according to what's been changed on the client(s) in a particular Media Set. Hence incremental. 

On a new backup the file size would be the same and this question would be moot. Merely looking to determine if Retro has a reporting issue, a file size sensitivity or both. And to quantify the anomaly.

My examples show various backups of the several Media Sets that are running on my system and how the small size of a given Media Set's incremental backup, when that occurs, is way slower (not counting the time 'idle/loading/preparing' as reported in Retro) in MB/min than a larger backup of the same Media Set, discounting fixed factors. 

I checked Retro's math and it seems right. My guesses are that Retro may be reporting factors that are not variables, or in the alternative that Retro's activity processes (whatever they are) do actually run slower when the file count or files' sizes are low. I was hoping for some enlightenment  as to which was the case and whether that bodes well for some improvement on the horizon, perhaps from Eric or someone knowledgeable at EMC in this regard. Still hoping...

The times required to back up a smaller incremental set calculates by Retro to <100MB/minute whereas a larger set runs at >300MB/minute. My question to the group- why the huge difference (3X) in speed if only the variable components are being measured? By the indications in the app the fixed components are reported separately… 

Is the question clearer to you now?

Henry
On Mar 29, 2010, at 01:53 , David wrote:

> Are you talking about a Media Set with a large number of files?

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Henry Seiden
Techworks Professional Systems, Inc.
15751 Sheridan Street, #407
Davie, FL 33331 USA






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