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Is there a software RAID alternative with file-level striping?

I'd like the the total capacity of the disks in the set to sum up like in RAID-0, but i also want the individual disks to be still mountable individually.

I know on Linux unionfs/aufs can combine multiple roots into one virtual directory, but it does not provide file-level striping.

Besides, i also want to keep the disks formatted with a Windows-compatible filesystem like FAT32 or NTFS, so btrfs in not an option.

Linux LVM does not seem an option as well because it does not support file-level striping.

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    No; you can not stripe files and still be able to mount only half of the stripe. – psusi May 11 '16 at 23:32
  • What OS(s?) will you want to run? I suppose more importantly, what's the main OS, since there's nothing I can think of that will be universal. – Journeyman Geek May 12 '16 at 4:28
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    The main OS is Linux. Maybe the term "RAID" is not completely appropriate here, but i think it still describes the idea. – eadmaster May 13 '16 at 22:03
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What you are asking does not seem very logical or safe. I've put these concerns aside for my answer -

You can't do this with block level tools, so looking for "RAID" solutions is not going to work. Also, for this reason you will not find a solution which runs FAT32 or NTFS. (RAID works at the block level, which sits below the filesystem)

You might want to look at abusing something like Gluster - I believe you could so this by setting up multiple bricks on different drives in the same system, which will, I believe, provide file level striping. You would need to run the Gluster server on a Linux type OS and then export it over NFS or CIFS or what have you.

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    I think it is safer than a RAID-0 setup where if a disk fails you possibly get all the files damaged. Obviously it is not as safe as RAID-1, but still looks good compromise IMO for storing small files. – eadmaster May 13 '16 at 21:23
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I've found the latest aufs supports branch-balancing, and there are also some fuse-based alternatives: mergefs and mhddfs.

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