Hello! What do you think about union mounting and UnionFS in particular?
Regards, I. Rubel > On 19. Apr 2019, at 07:20, Daniel Cegiełka <daniel.cegie...@gmail.com> wrote: > > Hi, > > I know that most people on this list use ext4 - Michael's oasis, > sta.li etc. We simply take ext4 and do not consider other options. I > don't want to start discussing which file system is the best and the > fastest, because it depends on the destination. I'm interested in > which file system sucks the least (in my opinion). > > I reject at the start: reiserfs and reiser4 - The first is intended > mainly for many small files (scalability). The second uses plugins, > which makes static linking difficult. > > * ext4 > This is a very rational choice. Unfortunately, ext4 is three > filesystems packed into one (ext4 can also support ext2 and ext3). If > someone has looked in the source code e2fsprogs will know what I mean. > > * XFS > A great file system if we are NASA and we are interested in HPC. XFS > is designed for large and fast servers, meaning it is > resource-consuming. > > * ZFS > Resource-consuming. Designed for large servers. > > * btrfs > Rather a good choice for server rooms (Facebook). > > * bcachefs > A good competition for btrfs/ZFS. > > * JFS [1] > Forgotten file system. JFS is what ext4 should be. This is a very well > thought and well-designed file system. It is very light and has a tiny > resource consumption. The first journaling file system plus unicode > support. Here is a small comparison of the kernel modules (size): > > # ls -lh `find kernel/fs/ -name jfs.ko -o -name ext4.ko -o -name > xfs.ko -o -name btrfs.ko` > -rw-r--r-- 1 root root 2.1M Mar 4 12:49 > kernel/fs/btrfs/btrfs.ko > -rw-r--r-- 1 root root 1.2M Mar 4 12:49 kernel/fs/ext4/ext4.ko > -rw-r--r-- 1 root root 342.6K Mar 4 12:49 kernel/fs/jfs/jfs.ko > -rw-r--r-- 1 root root 2.3M Mar 4 12:49 kernel/fs/xfs/xfs.ko > > Of course, JFS has disadvantages: > * no support for fallocate - the implementation of this in the Linux > kernel should not be difficult > * DAX [2] support has not been implemented (yet) > * JFS is only able to use 4k blocks (but DAX works only with 4k) > * no support in extlinux (lilo, grub/grub2 works fine) > > Would anyone be interested to start supporting JFS? I'm thinking about > rewriting jfsutils. > > Best regards, > Daniel > > [1] > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/filesystems/jfs.txt?h=v5.1-rc5 > [2] > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/filesystems/dax.txt?h=v5.1-rc5 >
