We assume the iFix MF70632_ppc.iso was downloaded from Fix Central and copied to the home directory (/home/hscroot) of user hscroot on the HMC hmc01. Then the iFix can be installed on hmc01 using the following command:

$ hmc updhmc -c hmc01 disk:/home/hscroot/MF70632_ppc.iso
The corrective service file offload was successful. Continuing with HMC service installation...
Verifying Certificate Information
Authenticating Install Packages
Installing Packages...warning: /dump/hsc_install.images/images/install.d/java/ibm-java-sdk-17.0.5.0-ppc64le.rpm: Header V3 RSA/SHA256 Signature, key ID 9bce9629: NOKEY
Installing Packages...
The corrective service file was successfully applied. A mandatory reboot is required but was not specified on the command syntax.
Shared connection to 172.168.99.18 closed.
ERROR: remote HMC command returned an error (2)
$ 

Note: The ISO file for a service pack can be several GB in size. The command shown therefore uses the option “-c” (clear). This ensures that the ISO file is deleted from the HMC’s hard disk after the update.

In case you always copy the ISO file to the HMC, you could set the attribute CorrectiveServiceLocation in /opt/pwrcmps/etc/lpar.cfg or ~/.lpar.cfg to the value “disk:/home/hscroot“:

...
CorrectiveServiceLocation disk:/home/hscroot
...

To start the update, simply specify the ISO file:

$ hmc updhmc -c hmc01 MF70632_ppc.iso
The corrective service file offload was successful. Continuing with HMC service installation...
Verifying Certificate Information
Authenticating Install Packages
Installing Packages...warning: /dump/hsc_install.images/images/install.d/java/ibm-java-sdk-17.0.5.0-ppc64le.rpm: Header V3 RSA/SHA256 Signature, key ID 9bce9629: NOKEY
Installing Packages...
The corrective service file was successfully applied. A mandatory reboot is required but was not specified on the command syntax.
Shared connection to 172.168.99.18 closed.
ERROR: remote HMC command returned an error (2)
$ 

Since the argument MF70632_ppc.iso is not a complete “location“, the default from CorrectiveServiceLocation “disk:/home/hscroot” is combined with MF70632_ppc.iso to form “disk:/home/hscroot/MF70632_ppc.iso“.