>We have designed a new stackable file system that we called RAIF: >Redundant Array of Independent Filesystems. > >Similar to Unionfs, RAIF is a fan-out file system and can be mounted over >many different disk-based, memory, network, and distributed file systems. >RAIF can use the stable and maintained code of the other file systems and >thus stay simple itself. Similar to standard RAID, RAIF can replicate the >data or store it with parity on any subset of the lower file systems. RAIF >has three main advantages over traditional driver-level RAID systems: > >1. RAIF can be mounted over any set of file systems. This allows users to > create many more useful configurations. For example, it is possible to > replicate the data on the local and remote disks, and stripe the data on > the local hard drives and keep the parity (or even ECC to tolerate > multiple failures) on the remote server(s). In the latter case, all the > read requests will be satisfied from the fast local disks and no local > disk space will be spent on parity. As for striping on a simplistic level, look at the Equal File Distribution patch for unionfs :-) http://www.mail-archive.com/unionfs@xxxxxxxxxxxxxxxxxxxxxx/msg01936.html Files are stored normally so that after the union is unmounted, the files appear in one piece (unlike real RAID0 over two block devices). -`J' -- - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
