On Dec 10, 2013, at 4:33 PM, Imran Geriskovan <imran.geriskovan@xxxxxxxxx> wrote: >>> Currently, if you want to protect your data against bit-rot on >>> a single device you must have 2 btrfs partitions and mount >>> them as Raid1. > >> No this also works: >> mkfs.btrfs -d dup -m dup -M <device> > > Thanks a lot. > > I guess docs need an update: > > https://btrfs.wiki.kernel.org/index.php/Mkfs.btrfs: > "-d": Data profile, values like metadata. EXCEPT DUP CANNOT BE USED > > man mkfs.btrfs (btrfs-tools 0.19+20130705) > -d, --data type > Specify how the data must be spanned across > the devices specified. Valid values are raid0, raid1, > raid5, raid6, raid10 or single. Current btrfs-progs is v3.12. 0.19 is a bit old. But yes, looks like the wiki also needs updating. Anyway I just tried it on an 8GB stick and it works, but -M (mixed data+metadata) is required, which documentation also says incurs a performance hit, although I'm uncertain of the significance. Chris Murphy-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
