Hugo Mills posted on Mon, 28 Dec 2015 01:58:07 +0000 as excerpted: > On Mon, Dec 28, 2015 at 01:50:09AM +0100, Christoph Anton Mitterer > wrote: >> On Sun, 2015-12-27 at 07:09 +0000, Duncan wrote: >> > raid1 mode >> I wonder when that reaches my pain threshold... and I submit a patch >> that renames it "notreallyraid1" in all places ;-) > > Isn't this an FAQ already? There is already a patch to rename the > RAID modes. It's been sitting in the progs patch queue for about 2 > years, because none of the senior devs has acked it yet (since it's a > big user-visible change).
I don't see it in the FAQ, but I see hints on both the sysadmin's guide and the usecases pages. (Either the wiki or firefox seems to be having certificate problems ATM and all I'm getting is an OCSP response has an invalid sig error. But the resurrect this page extension to the rescue, click the resurrect via google and I get it. Links has no problem loading the page, but lynx does, so it's not just firefox.) UseCases: First section is RAID, first question there is on creating a raid1 mirror in btrfs. It has this to say at the end of the answer: >>>>> NOTE This does not do the 'usual thing' for 3 or more drives. Until "N- Way" (traditional) RAID-1 is implemented: Loss of more than one drive might crash the array. For now, RAID-1 means 'one copy of what's important exists on two of the drives in the array no matter how many drives there may be in it'. <<<<< SysadminGuide: Second section is data usage and allocation. First subsection there is RAID and data replication. The first paragraph there is: >>>>> Btrfs's "RAID" implementation bears only passing resemblance to traditional RAID implementations. Instead, btrfs replicates data on a per- chunk basis. If the filesystem is configured to use "RAID-1", for example, chunks are allocated in pairs, with each chunk of the pair being taken from a different block device. Data written to such a chunk pair will be duplicated across both chunks. <<<<< The multi-device page has little theoretical discussion, only discussing current status and having a bunch of specific commandline examples. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
