Server 2012 De-dupe

[ubern00b]

Hi All

I am after someone with any experience of Server 2012 De-dupe. I have a volume that I have enabled de-duplication on and I am seeing very different data usage between the volume level and the file level. For instance:

This shows the size of the volume and free space:

But if I go into the volume and select all the files/folders (yes I have show hidden files and system files enabled and I am a domain admin so UAC *shouldn't* be stopping me traversing folders) then this is what I see:

Trying to figure out where my 7TB has gone as I cannot expand the volume any further and I wouldn't want to if I am meant to have 7TB somewhere. Any ideas are welcome!

 

[ubern00b]

Server manager shows:

Sooooo it shows it as correct, if my maths is in the correct ballpark?

Running some powershell though and seeing what the dedupe is up to, it has taken the optimization job about 4 hours to tick over from 13% to 14% and it doesn't appear that a GarbageCollection job has run in some time, so this may attribute to it.

I am clutching at straws though, since I know very little about the inner workings of Microsoft's de-dupe.

 

[ubern00b]

If the data is changed or deleted you need to run garbage collection at regular intervals, I would set this as once a week anyway.

Space savings at the file level is useless, always confirm through server manager. 51% savings isn't bad going though

Being SQL backups there are daily, weekly, monthly backups on there as well as hourly transaction logs. I should probably set it to de-dupe data older than 1 day instead of having it trying to de-dupe live data, do you think that would have any benefit?

 

[ubern00b]

I ran the garbage collection overnight and now have 4.5TB free, win. Thanks for your help, I will schedule garbage collection to run weekly as that seems to do the trick.