> N-copies, M-device-stripe, P-parity-devices (NcMsPp) At expense of being the terminology nut, who doesn't even like SNIA's chosen terminology because it's confusing, I suggest a concerted effort to either use SNIA's terms anyway, or push back and ask them to make changes before propagating deviant terminology. Strip is a consecutive blocks on a single extent (on a single device) Strip size is the number of blocks in a single extent (on a single device) Stripe is a set of strips on each member extent (on multiple devices) Stripe size is strip size times non-parity extents. e.g. Btrfs default strip size is 64KiB, therefore a 5 disk raid5 volume stripe size is 256KiB. I use and specify size units in bytes rather than SNIAs blocks (sectors) because it's less ambiguous. In other words, for M- what we care about is the strip size, which is what md/mdadm calls a chunk. We can't know the stripe size without knowing how many non-parity member devices there are. Chris Murphy -- 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
