2. After checking the  lpp_source , NIM, or directory for file updates by using the  -Q  flag, you  can perform the installation on the server. If you see Figure 2-6, the servers have issues  with the Network File System (NFS) where the update package is. In our scenario, we left  it that way to cause the preview error that is shown in Figure 2-6. 3. Back up your date before performing any upgrades on your servers. The  alt_disk_copy tool makes a mirror copy of your rootvg to another disk in a separate VG and Object Data  Manager (ODM). The  cl_ezupdate  tool may perform the backup while rolling your  updates, or before you perform the updates by using the flag  -X  or  -x :  Figure 2-6 The cl_ezupdate failed preview update installation /usr/es/sbin/cluster/utilities/cl_ezupdate -X -N bolsilludo2:hdisk6  (root@bolsilludo2):/> /usr/es/sbin/cluster/utilities/cl_ezupdate -P -s /tmp/> Checking for root authority... Running as root. Checking for AIX level... The installed AIX version is supported. Checking for PowerHA SystemMirror version... The installed PowerHA SystemMirror version is supported. Checking for clcomd communication on all nodes... clcomd on each node can both send and receive messages. INFO: The cluster: decano_bolsilludo is in state: STABLE INFO: The node: bolsilludo2 is in state: NORMAL INFO: The node: decano1 is in state: NORMAL Checking for lpps and interim fixes from source: /tmp/lp/powerha722sp1... WARNING: Directory /tmp/lp/powerha722sp1 does not exist on the node: decano1 WARNING: The directory /tmp/lp/powerha722sp1 will be Propagate from local  node to nodes: decano1 bolsilludo2 ERROR: The repository is NFS path and is not mounted on nodes: decano1 INFO: Please mount the repository on nodes: decano1 and retry. Chapter 2. New features  21