On Mon, 31 Jan 2011 19:51:32 -0200 Roberto Spadim <roberto@xxxxxxxxxxxxx> wrote: > now, a question.... > > if raid1 is like raid10 (one disk = raid0) > why not only one raid1 (raid10) software implementation? > for example, if i have 4 disks and i want 4 mirrors. > why not work with only raid10? why the option since we have all > features of raid1 inside raid10? > is it to allow small source code (a small ARM rom)? memory usage? cpu > usage? easy to implement? It is mostly "historical reasons". RAID1 already existed. When I wrote RAID10 I wanted to keep it separate so as not to break RAID1. I have never had a good reason to merge the two implementations. And RAID1 does have some functionality that RAID10 doesn't, like write-behind. Also RAID1 doesn't have a chunk size. RAID10 does. NeilBrown -- 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
