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Long defrag time when 0% framentation

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Over the weekend  I noticed that Defraggler took 9 hrs to defrag a LaCie 3 TB drive (6TB, RAID 1 configuration) with 0 Total Fragments and 0% Fragmentation before defragment took place.  Why should it take so long?  I would think that as the file became less and less fragmented over time it would take shorter periods of time to defrag.


On a side note  what would the Forum recommend as a default "Schedule" daily, weekly, monthly or based upon a percent fragmentation?




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few things to consider...


RAID1, or mirrored RAID, is when reliability is more important than performance.

you get all your data copied across all drives in the array so effectively, in a 2 drive array, all I/O gets doubled.

that would be one reason behind your 9hour process.


another would be the connection method.

be it USB2, USB3 or ethernet, all are huge I/O bottlenecks compared to internal 6GB SATA3 connections.

if you are using ethernet, make sure the LaCie and your PC have gigabit ports.


was there a reason you defragged a drive that had 0% fragmentation?

obviously, there is no benefit in doing so, so really all you are doing is giving your drives 9 hours of unnecessary activity.


I defrag my HDD maybe once every 6months.  I tend to use the percentage of fragmented files as a guide and if it's more than 20%, it's time for some housekeeping.

and even then, I just select the worst offenders and tell DF to only defrag those.

otherwise, you are not only getting your defrag software to rearrange the fragments, your are relying on it's internal calculations to re-arrange all your files based on some 'best fit' algorithm.


also consider what the LaCie is used for and whether is needs any defragging at all.

for example, if it's used for backups, or media streaming, or some other sort of 'data dump' repository, defragging becomes almost unnecessary.

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Thank you for the insights.  So apparently all it was doing was rearranging files - wasted time.  I  have my schedule settings running to often; so  I've reset to defrag at startup only when 10% or more. I use to run Diskeeper Pro but it no longer supports external drive and so I moved over to Defraggler which seems slower but probable a difference in defragging algorithms.  So I'll see how the new settings work for both my external(s) and local drive at 10%

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it would be great if you provide some feedback down the track with how you get on.

it may be of worth to others and their usage of DF. :)

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