Juan Piernas Canovas <[EMAIL PROTECTED]> writes: [playing devil's advocate here] > If the data and meta-data devices of DualFS can be on different disks, > DualFS is able to READ and WRITE data and meta-data blocks in > PARALLEL.
XFS can do this too using its real time volumes (which don't contain any metadata). It can also have a separate log. Also many storage subsystems have some internal parallelism in writing (e.g. a RAID can write on different disks in parallel for a single partition) so i'm not sure your distinction is that useful. If you stripe two disks with a standard fs versus use one of them as metadata volume and the other as data volume with dualfs i would expect the striped variant usually be faster because it will give parallelism not only to data versus metadata, but also to all data versus other data. Also I would expect your design to be slow for metadata read intensive workloads. E.g. have you tried to boot a root partition with dual fs? That's a very important IO benchmark for desktop Linux systems. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
