This post is about choosing the best performance options for Btrfs + SSD while still maximizing SSD lifetime. Here is my
/etc/fstab mount options:
Here is quotes from man pages, forums and wikis about options that I looking for. I decided to not to use
space_cache This space_cache option will be selected while mounting a mount point which has Btrfs file system. This will store the free space cache on the disk to make the caching of a block much faster. Without this, Btrfs has to scan the entire tree every time looking for the free space that can be allocated. If enabled, Kernel will have available FS free space block addresses in memory, thus when you create a new file it will immediately start writing data to disk. noatime Do not update inode access times on this filesystem (e.g., for faster access on the news spool to speed up news servers). nodiratime Do not update directory inode access times on this filesystem.
discard check your version with
sudo smartctl --info /dev/sda.
discard Enables discard/TRIM on freed blocks. Note that before SATA 3.1, TRIM commands are synchronous and will block all I/O while running. This may cause short freezes while this happens, for example during a filesystem sync. You may not want to use discard in that case but enable regular trims instead.
To enable fstrim run this
systemctl enable fstrim.timer
compress=lzo Enable compression. Starting with kernel 2.6.38 you can choose the algorithm for compression: compress=zlib - Better compression ratio. It's the default and safe for olders kernels. compress=lzo - Faster compression. compress=no - Disables compression (starting with kernel 3.6). inode_cache (since 3.0) Enable free inode number caching. Not recommended to use unless files on your filesystem get assigned inode numbers that are approaching 264. Normally, new files in each subvolume get assigned incrementally (plus one from the last time) and are not reused. The mount option turns on caching of the existing inode numbers and reuse of inode numbers of deleted files. This option may slow down your system at first run, or after mounting without the option. autodefrag https://firstname.lastname@example.org/msg30749.html space_cache,compress=lzo,discard,noatime,nodiratime,subvol=root