I am also a bit suprised they're running Debian 4 + JFS combination instead of something a bit more modern, like FreeBSD and ZFS, for example, my default choice

I am also a bit suprised they're running Debian 4 + JFS combination instead of something a bit more modern, like FreeBSD and ZFS, for example, my default choice when it comes to filesystem nowdays. I'd love to hear abou their reasoning behind that and possible plans (if any) to move to something more recent, when it comes to software layer.