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Forum Discussion
Please help me understand my used space
Hi, I have 2 2TB drives in the system. If I do `du -s /data` I get the used space as 154277424272. If I do a `df` I get used space as 1731570392. The difference is almost 200GB! Where does it go...
Drive firmware is in the drive flash memory, not on the platter. And df /data only reports on the data partition, so it does not include the OS partition.
mrQQ - you are running OS6 on this ultra, correct?
With BTRFS there are a lot of reasons why these numbers might not tie out. I think by default there are two copies of the metadata on the disk, which I think is enough to account for it (esp. if checksums are turned on). You might also add -a to the du command, and make sure it is counting the data in the hidden folders of the \data root.
In addition, snapshots/CoW create a discrepancy (though in the other direction - du reports more than df). Folder compression will also create a discrepancy (again in the other direction).
mrQQ - you are running OS6 on this ultra, correct?
With BTRFS there are a lot of reasons why these numbers might not tie out. I think by default there are two copies of the metadata on the disk, which I think is enough to account for it (esp. if checksums are turned on). You might also add -a to the du command, and make sure it is counting the data in the hidden folders of the \data root.
In addition, snapshots/CoW create a discrepancy (though in the other direction - du reports more than df). Folder compression will also create a discrepancy (again in the other direction).
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