Keld Jørn Simonsen wrote: > On Tue, Jan 29, 2008 at 06:13:41PM +0300, Michael Tokarev wrote: >> Linux raid10 MODULE (which implements that standard raid10 >> LEVEL in full) adds some quite.. unusual extensions to that >> standard raid10 LEVEL. The resulting layout is also called >> raid10 in linux (ie, not giving new names), but it's not that >> raid10 (which is again the same as raid1+0) as commonly known >> in various literature and on the internet. Yet raid10 module >> fully implements STANDARD raid10 LEVEL. > > My understanding is that you can have a linux raid10 of only 2 > drives, while the standard RAID 1+0 requires 4 drives, so this is a huge > difference. Ugh. 2-drive raid10 is effectively just a raid1. I.e, mirroring without any striping. (Or, backwards, striping without mirroring). So to say, raid1 is just one particular configuration of raid10 - with only one mirror. Pretty much like with raid5 of 2 disks - it's the same as raid1. > I am not sure what vanilla linux raid10 (near=2, far=1) > has of properties. I think it can run with only 1 disk, but I think it number of copies should be <= number of disks, so no. > does not have striping capabilities. It would be nice to have more > info on this, eg in the man page. It's all in there really. See md(4). Maybe it's not that verbose, but it's not a user's guide (as in: a large book), after all. /mjt - 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
