We have numerous SAP systems running on AIX and Linux. It can be time consuming to update the HostAgent on all these systems.
All our SAP systems running on AIX and Linux mount a common NAS filesystem called /usr/sap/basis.
I have two folders created
A hidden file ".delay" is created in /usr/sap/basis/HostAgent/AIX. This is to prevent all SAP host from updating the HostAgent at the same time.
ls -l .delay
-rw-r--r-- 1 smdadm sapsys 12 Feb 3 08:21 .delay
The latest versions of the SAP HostAgent are downloaded and put in the respective folders above.
On every host running SAP, a soft link 'new' mapped to "/usr/sap/basis/HostAgent/AIX" is created in the /usr/sap/hostctrl folder
Example for an AIX host :
directory /usr/sap/hostctrl ; ls -l
drwxr-x--- 2 root sapsys 4096 Feb 3 08:47 exe
lrwxrwxrwx 1 root system 28 Sep 27 2011 new -> /usr/sap/basis/HostAgent/AIX
drwxr-x--- 5 sapadm sapsys 4096 Mar 7 23:38 work
After 30mins, all the SAP Systems HostAgent is updated to the latest version and restarted.
SAP Note 1031096 has an attached document that provides additional infornation on updating the SAP HostAgent package.