How Use Fallocate Command in Linux?

fallocate is used to preallocate blocks to a file. For filesystems that support the “fallocate” system call, this is done quickly by allocating blocks and marking them as uninitialised, thus requiring no I/O to the data blocks. This is a much faster method of creating a file rather than filling it with zeros.

What does Fallocate do in Linux?

fallocate is used to manipulate the allocated disk space for a file, either to deallocate or preallocate it. For filesystems which support the fallocate system call, preallocation is done quickly by allocating blocks and marking them as uninitialized, requiring no IO to the data blocks.

How create 1 GB file in Linux?

Linux / UNIX: Create Large 1GB Binary Image File With dd Command

1. fallocate command – Preallocate space to a file.
2. truncate command – Shrink or extend the size of a file to the specified size.
3. dd command – Convert and copy a file i.e. clone/create/overwrite images.
4. df command – Show free disk space.