Rustedt, Florian <florian.rustedt@xxxxxxxxxxx> wrote: > If the speed on RAID 0 is based on reading out in parallel, then it must be > the same on RAID 1, mustn't it? > On RAID 1, it is possible, to read two blocks in parallel to speed up, too. It's not that simple. On RAID0 you can read one single stream of data from all of the disks in parallel: you read one stream from each disk with each stream containing completely different data and merge them together to get the original stream. On RAID1 you can only read exactly the same stream from all of the disks. Thus, RAID1 cannot provide RAID0's speed-up for a single stream. However, if you read multiple streams parallel, RAID1 can do better than RAID0 because you can read stream1 from disk1, stream2 from disk2 etc. Using RAID0, this speed-up can only be achieved for streams <= chunk size. regards Mario -- Tower: "Say fuelstate." Pilot: "Fuelstate." Tower: "Say again." Pilot: "Again." Tower: "Arghl, give me your fuel!" Pilot: "Sorry, need it by myself..." - 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
