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| Name | Current message text |
|---|---|
| h English (en) | === Copy on Write! (Btrfs)=== Copy on Write is a "new" concept. It means the file system will try to '''never''' write over existing data. '''How is this even possible?''' * Files are appended at the end of a "data page" * Metadata is appended at a "metadata page" * Inside a page '''nothing is ever overwritten''' * When a page is full the file system will use the next free page * Deleting a file does not write/clean its data, but writes metadata, that marks this file as deleted * Overwriting a file does first append the new file to the actual "data page", then appends the metadata for this file to the "metadata page". * Changing small parts of a file will write only the new parts, then ''link'' the rest to the old file * there are checksums for data and metadata |