On Sat, 28 Jun 2014 04:26:43 +0000 (UTC) Duncan <1i5t5.dun...@cox.net> wrote:
> Russell Coker posted on Sat, 28 Jun 2014 10:51:00 +1000 as excerpted: > > > On Fri, 27 Jun 2014 20:30:32 Zack Coffey wrote: > >> Can I get more protection by using more than 2 drives? > >> > >> I had an onboard RAID a few years back that would let me use RAID1 > >> across up to 4 drives. > >> > > Currently the only RAID level that fully works in BTRFS is RAID-1 with > > data on 2 disks. > > Not /quite/ correct. Raid0 works, but of course that isn't exactly > "RAID" as it's not "redundant". And raid10 works. But that's simply > raid0 over raid1. So depending on whether you consider raid0 actually > "RAID" or not, which in turn depends on how strict you are with the > "redundant" part, there is or is not more than btrfs raid1 working. Also depending on what you consider "fully works", RAID1 may not qualify too, as neither the read-balancing, nor write-submission algorithms are ready for production use, performance-wise. (RAID1 writes to two disks sequentially, not at the same time; and reads are satisfied from in effect a random device, not from the least-busy device). -- With respect, Roman
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