On 09/03/13 20:31, Hugo Mills wrote: > Some time ago, and occasionally since, we've discussed altering the > "RAID-n" terminology to change it to an "nCmSpP" format, where n is the > number of copies, m is the number of (data) devices in a stripe per copy, > and p is the number of parity devices in a stripe. > > The current kernel implementation uses as many devices as it can in the > striped modes (RAID-0, -10, -5, -6), and in this implementation, that is > written as "mS" (with a literal "m"). The mS and pP sections are omitted > if the value is 1S or 0P. > > The magic look-up table for old-style / new-style is: > > single 1C (or omitted, in btrfs fi df output) > RAID-0 1CmS > RAID-1 2C > DUP 2CD > RAID-10 2CmS > RAID-5 1CmS1P > RAID-6 1CmS2P Are these the only valid options? Are 'sensible' new levels (eg 3C, mirrored to 3 disk or 1CmS3P, like raid6 with but with 3 parity blocks) allowed? Are any arbitrary levels allowed (some other comments in the thread suggest no)? Will there be a recommended (or supported) set? -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
