raid10 could be used as raid1+raid0 so raid1+raid0 implementation could allow write-behind, raid10 don´t =] 2011/1/31 NeilBrown <neilb@xxxxxxx>: > On Mon, 31 Jan 2011 20:53:07 -0200 Roberto Spadim <roberto@xxxxxxxxxxxxx> > wrote: > >> uhmmmmm write-behind is nice, >> raid0 have chunk size, don´t? > > Yes, but we weren't discussing RAID0 (???) > > NeilBrown > >> >> 2011/1/31 NeilBrown <neilb@xxxxxxx>: >> > 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 >> > >> >> >> > > -- > 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 > -- Roberto Spadim Spadim Technology / SPAEmpresarial -- 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
