I searched the forums for the too many files open error and hit
http://www.zimbra.com/forums/adminis...les-error.html.
I checked ulimit -n and it returned 1024.
I checked /etc/security/limits.conf and it already had the following lines in below the "# End of file":
zimbra soft nofile 524288
zimbra hard nofile 524288
Note that these are different from what the post above says.
As the post suggested I added the following to /etc/pam.d/common-session:
session required pam_limits.so
I logged in with user zimbra and ulimit -n now gave me 524288.
So I restarted Zimbra and now I can migrate my mail to the 64-bit Zimbra.
So far so good!
regards Bart.