On Mon, Apr 26, 2010 at 11:57:09AM -0700, Andrew Klaassen wrote: > --- On Mon, 4/26/10, Michael Evans <mjevans1983@xxxxxxxxx> wrote: > > > > --- On Mon, 4/26/10, Michael Evans <mjevans1983@xxxxxxxxx> > > wrote: > > > However, it doesn't say what happens with a larger > > > number of drives. I'm looking for the kind of control I > > > can get with RAID 1+0, where I can specify which drives are > > > mirrors of each other. Is that possible with RAID10? > > > > No, not predictably; the only provided guarantee is that > > the data will > > /not/ be duplicated on the same block-device (usually > > drive). In > > practice you will quickly be able to determine where a > > particular > > version with a given range of input causes data to be > > stored, but > > there is no requirement that future versions produce the > > precise same > > alignment and offsets. > > Ah. So if I want this level of control, I have to sacrifice the advantages of RAID 10 and go with RAID 1+0. > > Good to know. Thanks. I think you can control the exact layout of copies in raid10 at creation time for the raid. How exactly it will play I am not sure - maybe Neil can tell us. Anyway you should be able to use raid10 as one of the components in a raid 1+0 like scenario, eg as the raid1 part of the raid 1+0. best regards keld -- 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
