From: Neil Brown <neilb@xxxxxxxxxxxxxxx> Date: Tue, Sep 14, 2004 at 11:08:53AM +1000 > A new format is being supported because the old format has problems. > One is that it cannot work with devices larger than 2 Gigabytes (and I > have had a request from someone who wanted to include such a device in > an MD array). I presume you mean terabyte, but I'm not sure you don't mean petabyte or something else very large? > The raid10 module is in 2.4.9-rc2 and will be in 2.4.9 when it gets > released. 2.6.9 I presume? > /* > * RAID10 provides a combination of RAID0 and RAID1 functionality. > * The layout of data is defined by > * chunk_size > * raid_disks > * near_copies (stored in low byte of layout) > * far_copies (stored in second byte of layout) > * > * The data to be stored is divided into chunks using chunksize. > * Each device is divided into far_copies sections. > * In each section, chunks are laid out in a style similar to raid0, but > * near_copies copies of each chunk is stored (each on a different drive). > * The starting device for each section is offset near_copies from the starting > * device of the previous section. > * Thus there are (near_copies*far_copies) of each chunk, and each is on a different > * drive. > * near_copies and far_copies must be at least one, and there product is at most ----------------------------------------------------------their > * raid_disks. > */ Good luck, Jurriaan -- If you hear muffled screams, consider it a request for beam out. Tom Paris in Voyager Debian (Unstable) GNU/Linux 2.6.9-rc1-mm4 2x6209 bogomips load 0.14 - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
