I have installed zimbra on a ubuntu 8.04 system.

When trying to start, I get this error:
Code:
df: no file systems processed
        WARNING: Disk space below threshold for /opt/zimbra.
df: no file systems processed
        WARNING: Disk space below threshold for /opt/zimbra/logger/db.
        Starting logger...Done.
df: no file systems processed
        WARNING: Disk space below threshold for /opt/zimbra/store.
df: no file systems processed
        WARNING: Disk space below threshold for /opt/zimbra/db.
df: no file systems processed
        WARNING: Disk space below threshold for /opt/zimbra/index.
df: no file systems processed
        WARNING: Disk space below threshold for /opt/zimbra/redolog.
but, I have plenty of free space
df gives:
Code:
Filesystem           1K-blocks      Used Available Use% Mounted on
0.0.0.0:/vgstorage/cloud-cust-svr-005
                      20642432   3596032  15997824  19% /
varrun                 1030904        60   1030844   1% /var/run
varlock                1030904         0   1030904   0% /var/lock
udev                   1030904         4   1030900   1% /dev
devshm                 1030904         0   1030904   0% /dev/shm
none                   1030904         0   1030904   0% /dev/shm
The only unusual thing ist, that it is a diskless system.
the whole filesystem is on a NFS-mount.

any hints for me?