This page is automatically translated.
The remaining capacity is smaller or larger than the uploaded file capacity.
With TeraCLOUD, the uploaded file and all existing files in the user`s data area are contained in the usage capacity. Additionally, TeraCLOUD 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 differences regarding the file system and the calculation method listed above, there may be a difference from the client's display side.
About file compression
With TeraCLOUD, the file compression function which is one of the multiple functions of ZFS is enabled. Usage capacity is calculated based n the size after compression.
*The compression ratio varies depending on the file contents.
Details on the ZFS snapshot.
The ZFS snapshot is a read-only copy of the file system. A ZFS snapshot can be created practially without delay, in which case no additional capacity is required. Capacity will be consumed by a subsequent data change.
TeraCLOUD routinely creates ZFS snapshots for each data area of the customer, creating a data backup.
*The function of users restoring data from snapshot and deleting the snapshot itself is currently being developed.
On calculation of remaining capacity
Remaining capacity is calculated based on the usage capacity of the entire data area of the user. *This includes the image thumbnail data at the time of logging in to the ZFS snapshot browser. As a result, displayed capacity might appear to be less than the authentic uploaded capacity.
Updated January 31, 2018