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The remaining capacity is smaller or larger than the uploaded file capacity.
In TeraCLOUD, not only the uploaded file but also all the files existing in the customer's data area are included in the usage capacity. In addition, TeraCLOUD is managed by the file system called Oracle Solaris 11 ZFS and calculates the "size on disk" instead of "the size of the file itself" as the used capacity.
The following ZFS functions are enabled in TeraCLOUD, which affects the usage capacity.
- ZFS snapshot function: File system image for data restoration
- ZFS compression function: Compression rate varies depending on file contents
Due to the difference of the file system and the calculation method according to the above, there may be a difference from the display on the client side such as PC.
About file compression
In TeraCLOUD, the file compression function which is one of the functions of ZFS is enabled. Usage capacity is calculated based on the size after compression.
*The compression ratio varies depending on the file contents.
What is ZFS snapshot?
It is a function of ZFS, a read-only copy of the file system. A ZFS snapshot can be created nearly instantaneously, in which case no additional capacity is required. Capacity will be consumed by subsequent data change.
TeraCLOUD regularly creates ZFS snapshots for each data area of the customer, making it a data backup.
*The function of restoring data from snapshot by customer operation and deleting the snapshot itself is currently under construction.
On calculation of remaining capacity
The remaining capacity is calculated from the usage capacity of the entire data area of the customer including the image thumbnail data at the time of logging in to the ZFS snapshot browser. Therefore, it may be displayed less than the actual uploaded capacity.
Updated January 31, 2018