One of the disadvantages of the BSD license to users, is that it doesn't grant you a patent licence on the code, like eg. ZFS's CDDL does.What stops them from releasing ZFS under the BSD license? GPL is there for good reasons and it's the best license when you want to compete with other projects. However, its restrictions have nothing to this thread and strange Oracle's behavior.
If you want to use ZFS just use BSD.
The only reason why the Lawrence Liverpool people want to use ZFS on Linux is because they hit the limits of the Ext4-based storage for their Lustre backends.
Also nowadays, because of going back to closed source, ZFS has two major forks:
1. Solaris ZFS
2. Open Source ZFS
Solaris ZFS can read and import Open Source ZFS, but the reverse is not true. ZFS is backwards compatible, but not forward compatible and the Solaris ZFS has new features that the Open Source ZFS does not have.
Well.Yes. But even if Btrfs doesn't die, Btrfs and its GPL licence puts other *nix systems in exactly the same position as ZFS is on Linux: they can use it, but they can't distribute it with their kernel. This isn't any better for interoperability.
A) Oracle can't close source BTRFS like they did with ZFS. The reason being is that while they did sponsor the development originally and hosted the websites for it originally they do not own the copyrights.
B) It's a Linux file system shares code extensively with Linux-VFS, So it's a derivative and has to be licensed GPL.
C) Portable file systems were never much of a priority for anybody. Unix systems, including BSD, used UFS/FFS fairly universally. Even OS X supported it. However they tended to introduce subtle changes and assumptions so that even though they share a common code base portability was undermined.
In theory, for reliable software raid 5, raidz can't be beat. I think practice is still catching up to theory, but I hope they keep working on it.
Its really a fantastic and well engineered project.
Dead horse? Nigga please ... ZFS thrives, both on Illumos and BSDs, You can even use now Boot Environments on FreeBSD: http://forums.freebsd.org/showthread.php?t=31662
ZFS can use all memory if YOU ALLOW it for, but You can limit ARC size to the size You want, and ZFS will stop there, for example You can 'sacrifice' 256MB for ZFS ARC (CACHE) and it will not take more.
Deduplication is other thing, You need about 2-3GB RAM for every 1 TB of data, but if You have 40TB for example, You do not need 120GB RAM, You can successfully use ZFS with about 40GB RAM with 80 GB SSD for L2ARC. You can also use 40TB pool under ZFS with, for example 4GB RAM, but reading all hashes directly from disk will be dead slow, RAM in deduplication is needed to hold the hash table for the deduplicated blocks.