start-btrfs-dmcrypt : ... echo "$pwd" | ... Hmmm. This makes the plaintext password visible in ps output. It is probably better to pass this in by redirecting a file to stdin.
On Mon, May 5, 2014 at 2:25 PM, Marc MERLIN <m...@merlins.org> wrote: > On Mon, May 05, 2014 at 10:51:46PM +0200, john terragon wrote: >> Hi. >> I'm about to try btrfs on an RAID0 md device (to be precise there will >> be dm-crypt in between the md device and btrfs). If I used ext4 I >> would set the stride and stripe_width extended options. Is there >> anything similar I should be doing with mkfs.btrfs? Or maybe some >> mount options beneficial to this kind of setting. > > This is not directly an answer to your question, so far I haven't used a > special option like this with btrfs on my arrays although my > undertstanding is that it's not as important as with ext4. > > That said, please read > http://marc.merlins.org/perso/btrfs/post_2014-04-27_Btrfs-Multi-Device-Dmcrypt.html > > 1) use align-payload=1024 on cryptsetup instead of something bigger like > 8192. This will reduce write amplification (if you're not on an SSD). > > 2) you don't need md0 in the middle, crypt each device and then use > btrfs built in raid0 which will be faster (and is stable, at least as > far as we know :) ). > > Then use /etc/crypttab or a script like this > http://marc.merlins.org/linux/scripts/start-btrfs-dmcrypt > to decrypt all your devices in one swoop and mount btrfs. > > Marc > -- > "A mouse is a device used to point at the xterm you want to type in" - A.S.R. > Microsoft is to operating systems .... > .... what McDonalds is to gourmet > cooking > Home page: http://marc.merlins.org/ | PGP > 1024R/763BE901 > -- > 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 -- 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
