volume available space shows different than actual usage

I have a netapp appliance with several volumes on it. One volume has a space of 5 TB. we only used about 40 GB size for oracle backup purpose, but in the netapp interface, it show 2.49 TB has been used.

could anyone explain this to me?

thanks.
netapp-storage-volume-statistics.png
Jason YuAsked:
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JohnBusiness Consultant (Owner)Commented:
Get Tree Size (Jam Software) and use it to review your disk usage (sort in order of usage).

Often backups and shadow storage account for blocks of usage, but you have a big block there. Tree Size is top notch for this.
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Jason YuAuthor Commented:
Is it for windows OS? the netapp volume is being used for linux.  This volume was mounted to linux servers only.

thanks.

"TreeSize Professional is a powerful and flexible hard disk space manager for Windows 8/7/Vista/XP or Windows Server 2012/2008/2003 (32 or 64 Bit). Native 64 Bit support makes sure that available memory will never pose a restriction - not even on the largest systems."
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JohnBusiness Consultant (Owner)Commented:
For Linux, the DIR command or like can be used with parameters to sort by size (date or whatever). Use that to see where the space is going. See if there may be hidden folders (I don't think so in Linux).

Here is a technical reference on the DF command (with parameters) to help you.

http://www.tecmint.com/how-to-check-disk-space-in-linux/
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robocatCommented:
Did you take into account:

- volume snapshot reservation
- volume snapshots
- LUN reservation (if LUNs are used - you didn't specify)
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Jason YuAuthor Commented:
I got it resolved yesterday afternoon after chatted with netapp technician.

The reason was the size on the aggregate was smaller than the allocated size for this thin lun. So, the maximized size the lun can use is decided by the left size on the aggregate.

Thanks all for the help and have a good day.
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JohnBusiness Consultant (Owner)Commented:
@Jason Yu  - You are very welcome and I was happy to help.
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