On Thu, Jun 05, 2014 at 03:30:26PM +0200, Swâmi Petaramesh wrote: > Hi, > > I just received a new laptop with a Micron 256GB SSD, and I plan to install > Fedora 20 onto it. > > I'm considering either BTRFS or ext4 (over LUKS-encrypted LVM) for this > machine, but I'm afraid BTRFS might generate too much writes and shorten the > SSD lifespan... Or am I mistaken ?
Yeah, 1) a lot of us use btrfs on SSDs 2) SSD write lifetime is more than you think However SSDs, especially at least earlier models of the one you got, still randomly die, and take your data with them. It's not because of number of writes, but bad firmware and/or a single chip that dies and isn't redundant on some drives. > Is there any pro/cons currently, on a 3.14 kernel, about using BTRFS along > with an SSD ? It's not foolproof, but works well enough for many. Have backups, but because of your SSD, you should definitely have backups anyway. > Is there specific advice about leaf size, use of compression, snapshots, > (auto-)defrag etc, that might be relevant especially for SSDs ? compression: lzo, not zlib (zlib will slow down your SSD) snapshots: http://marc.merlins.org/perso/btrfs/2014-03.html#Btrfs-Tips_-How-To-Setup-Netapp-Style-Snapshots auto-defrag: not really (read the archives) other options: leave default add -o discard to mount options Do not use LVM, it's totally unnecessary and will slow you down. Dmcrypt is ok, however add discard to cryptsetup options too: root2 /dev/sda2 /pwd luks,discard legolas:~# grep discard /proc/cmdline root=/dev/mapper/cryptroot ro rootflags=subvol=root cryptopts=source=/dev/sda4,keyscript=/sbin/cryptgetpw,discard 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/ -- 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
