Can't defrag large file 30gb

Defraggler
1

Hi All

Defraggler: v2.13.670 (64-bit)

OS: Windows 7 (64-bit) SP1 + all system updates

RAM: 16GB

Hard drive being defragged: 4 x Seagate ST3000DM001 (3TB) in Raid 10

I have a number of large files (VirtualBox virtual disk files) that wont defrag. I've tried doing a quick defrag before doing an Analyze and then picking the file (41,265 fragments) I want defragged. When I try to defrag it at the end I receive the error message:

Defrag Aborted.

No files were defragmented.

This option could not be done.

For the drive containging the file to be drefragged, Defraggler is reporting:

Used space: 441,834,795,008 bytes (7%)

Free space: 5,559,209,689,088 bytes (93%)

As you can see from the attached disk map there is an abundance of contiguous free space but the file is never defragged :(

Any ideas please?

Thanks for taking the time to read this - Peter

post-66045-0-21201100-1365901456_thumb.png

2

I thik you won't gain any benefits by defragmenting such large files, unless they are composed by an insane number of fragments.

3

first guess would be to blame the RAID1+0, can DF handle that?.

next would be to look at the options you are running DF with.

and lastly, just to get the file defrag'd at least, move the file off the drive, DF the drive, then move it back on.

long winded, but it'll do the job if it's important to get that file defrag'd.

4

I thik you won't gain any benefits by defragmenting such large files, unless they are composed by an insane number of fragments.

I think one file comprised of almost 42,000 fragments qualifies as insane! Certainly enough to affect to noticeably affect performance.

5

What kind of file is this? Streaming media? Backup image?

6

What kind of file is this? Streaming media? Backup image?

See above "VirtualBox virtual disk" file.

Thanks - Peter

7

The OP says in his post that it is a VirtualBox virtual disk file.