Solved Anyone else experience Defraggler unbearably slow on RAID 6?

December 25, 2016 at 05:43:34
Specs: Windows 7, 32 GB
I've used Defraggler Pro for years, but found it to be unbearably slow on systems with RAIDs. Why I didn't trash this piece of garbage long ago is a testament to how unsafe it feels to change. But I just ran it on an 18TB RAID 6 PC (w/ 4 tb of files) for EIGHT days straight, at close to 100% CPU, only to get it to 65% done. 8 days later! Then, insult to injury, when I tried to exit out of this horror, it took 12 minutes to let me out of it.

I then (cautiously) tried SmartDefrag portable, expecting something similar. But even at the slowest setting, it was done in less than an hour.

OK. So was SmartDefrag faking it? I tried Auslogic portable to make sure SmartDefrag was reporting accurately. Sure enough, in minutes, it reported nothing to defrag.

My conclusion? Defraggler Pro has serious flaws in its code, causing it to get lost in loops for days at a time. Not the least of which is the unnecessary wear and tear on my drives. My Advice? STAY AWAY.

See More: Anyone else experience Defraggler unbearably slow on RAID 6?

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December 25, 2016 at 07:01:45
✔ Best Answer
Have you tried using the Debug mode:

Might give you an idea of what's going on.

Since your using the Pro version have you tried to contact Piriform directly, or
you might want to post your concerns here:


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December 25, 2016 at 14:58:32
I used one or both of those defrag programs in Windows 7
well over a year ago, in order to get a visual of the disk layout.
I remember that there was something I so disliked about one
defrag program that I uninstalled it and downloaded another.
But except for the fact that SmartDefrag was one of them, I
don't remember which was which.

That was on a desktop computer with 640 GB hard drive
and 2.8 GHz CPU. On my new Windows 10 laptop, with 1 TB
hard drive and 1.6 GHz CPU, a defrag using Defraggler took
a couple of hours. Way longer than I remember the last defrag
on my Windows 7 desktop. I wonder if Defraggler is the app
that I disliked, and SmartDefrag is what I replaced it with.
But I have a vague recollection that the word "Smart" was

The screen layout of Defraggler was slightly different from
what I was expecting. I supposed it was a version change.
Maybe I was remembering SmartDefrag.

-- Jeff, in Minneapolis

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December 26, 2016 at 00:53:20
Apparently by chance, I happened to see where I recorded the
fact that Smart Defrag was the last defrag program I used on
my Windows 7 desktop, so it is the one I preferred.

I can't believe how windy it is here right now. The Internet says
the windspeed is 22 mph, but my guess is that it is at least twice
that here on the fifth floor, and it keeps increasing.

-- Jeff, actually in Richfield, just south of Minneapolis

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December 26, 2016 at 07:52:50
Thanks for the reassurance, Jeff. And for the good suggestions, Mike. And Mike, know had this not happened to me a year ago on two other computers with RAIDS. I might have taken your suggestions. As I said, change is hard. This said, to be honest, after many years of computing (since 1983) including a degree in it and doing it for a living for a while, the last thing I want to spend my free time doing is debugging the problems in software I've paid for.

Seriously, thank you both. This kind of feedback is so helpful.

message edited by stevent10993

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December 26, 2016 at 07:57:13
I assume the machine in question is other than a standard home desktop PC. But otherwise, I didn't think manual defragging was really necessary anymore? Windows does it automatically. I can't remember the last time I manually defragged my HDD. For the heck of it, I just right clicked on my C: partition, then Properties > Tools > Defrag Now & the list of partitions came up saying 0% fragmented.

This statment from the above article is important: "The one exception to this rule is if you turn your PC off every time after using it—essentially, if you never let the PC sit idle at all, the defrag task will never get a chance to run."

message edited by riider

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December 26, 2016 at 09:59:12
riider, your assumption is correct. I'd don't own a single ordinary PC. My work includes filming / editing multicam videos at two sites, and mixing / mastering music & voice.

My latest video PC has a 24 bay SSD Raid 5 attached to it. Thus the defrag problem is a not an issue. But the video PC in question has an 8 bay x 3TB HDD attached to it, and this RAID does get fragmented, the result of frequently ingesting, processing, and removing copious TB's of files.

I suppose you're right; leaving on probably does reduce the necessary defragging by some small factor. But given the high data flow, I still find defragging necessary, especially when fragmentation significantly reduces RAID throughput on a drive with this much data.

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December 26, 2016 at 10:45:26
the last thing I want to spend my free time doing is debugging the problems in software I've paid for.

If I paid for the software, I think I would be more inclined to contact the company and complain. It may be a problem they are unaware of, or with any luck, it might be a simple fix.


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