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linux - Mountable filesystem that automatically splits files


Is there a [virtual-]filesystem that can automatically split files in storage but present them to the user as single files?


For example:


The user sees: /user/files/10TBfile
But it is stored as: /backingstorage/user/files/10TBfile.{1..100}

Basically the same way a split archive works but in real time. I feel like it should be possible since it's basically storing each virtual disk block as a separate file but I don't know of any existing solutions for it.


If you're curious, the end goal might be something similar to this question: Divide out local files in different servers with limited space with rsync except that I have single large files that need to be split and the files need to be updated in real-time so a daily cron/rsync and split tar are out of the question. I already have the remote drives mounted so I just need a way to split the file and present it as a single file to the user.


Thanks!



Answer



What you want is chunkfs:



ChunkFS is a FUSE based filesystem that allows you to mount an arbitrary file or block device as a directory tree of files that each represent a chunk of user-specified size of the mounted file.



It was written for the same purpose as yours:



ChunkFS was originally written for making space-efficient incremental backups of encrypted filesystem images using rsync. Using the --link-dest option of rsync, you can create incremental backups from the ChunkFS-mounted image where any chunk that hasn't changed since the last backup will be a hard link to the corresponding chunk from the previous backup.



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