On Fri, 6 May 2011 11:41:02 +0200 Keld JÃrn Simonsen <keld@xxxxxxxxxx> wrote: > > RAID1 is traditionally a mirror only setup (ok, some RAID > > implementations may do some load-balancing of some sort). So a RAID1 > > with 4 disks is one data set copied onto 4 disks. Bandwidth is roughly > > the same as a single disk (ignoring any load balancing). > > RAID10 is mirror and stripe. A RAID10 with 4 disks is similar to a 2 > > disk RAID0 (double bandwidth with data split in half across both disks), > > but with each disk having a mirror (which brings the total up to 4 drives). > > > > Additionally, a RAID1 disk (at least using MD) can be accessed just like > > a normal disk (good for recovery etc.) however a single disk out of a > > RAID10 array is next to useless. > > I think you are demonstrating some of my points about general knowledge > quite nicely. Don't worry, you are not alone. So what is your proposal: people do not know they can do X, but commonly do Y, so let's rename X to Y so that both things are called Y and they 'know how to do it'? RAID10 is an established term and means "stripe of mirrors", period. RAID1 means just a mirror. All the rest is just implementation details. Trying to redefine 2x2 to be 5 as some 'educational project' is definitely misguided. -- With respect, Roman
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