MergeRFS is a tool for pooling drives and folders together so that individual files are complete on the same drive. The major benefit to this over a RAID system is that the system does not need to rewrite the entire raid pool when more storage is added, and in the case that a drive fails, any file that was not on that drive continues to be intact, so only the files on that particular drive need to be replaced. This is beneficial in systems where the storage pool is considered a local cache where any lost files can be replaced when needed, such as home media servers. It currently exists as a commandline, but being able to set up, view, and configure a mergeRFS pool in webmin would be useful.
A + B = C
/disk1 /disk2 /merged
| | |
+-- /dir1 +-- /dir1 +-- /dir1
| | | | | |
| +-- file1 | +-- file2 | +-- file1
| | +-- file3 | +-- file2
+-- /dir2 | | +-- file3
| | +-- /dir3 |
| +-- file4 | +-- /dir2
| +-- file5 | |
+-- file6 | +-- file4
|
+-- /dir3
| |
| +-- file5
|
+-- file6