second hard disk and home directory

I don't really recommend multiple home directories. I don't think suexec will allow it, either. I believe we experimented with symbolic links and suxec in the past (though in a different context and for different reasons) and I think it refused to run things because of the linking outside of /home.

I would recommend using LVS to add the new disk to the volume, and then resize the file system...but if you aren't using LVS, this won't be an option. Red Hat Magazine has some pretty good coverage of LVM and resizing file systems and such.

http://magazine.redhat.com/2008/07/16/tips-and-tricks-what-is-the-proced...

Another option would be to backup your /home, and then add it to either a volume or as a stripe in a RAID. Or, if the new disk is "big enough", just copy everything over to it, and remount it as /home.

Links are never going to be the best choice for something like this.

Virtualmin does have a rather old-fashioned feature where it can put homes into different directories under /home based on the first letter...so, something like, /home/v/virtualmin/ and /home/j/joesdomain, etc. But this is primarily for organization in an environment with thousands of virtual servers. There was also a time where some UNIX file systems got really slow with more than a few hundred files, so sub-directories would be used to keep any individual directory small. But, that's old news. Hasn't been relevant in many, many years. Almost certainly better to keep it flat. And I definitely wouldn't recommend it in your case, where it would be a hack to work around a too small /home. Make /home bigger. That's the only sane option.