Grid Infrastructure Installation and Upgrade Guide Configuring Operating Systems for Oracle Grid Infrastructure on IBM AIX on POWER Systems (64–Bit) Tuning AIX System Environment Increasing System Block Size Allocation Increasing System Block Size Allocation Perform the following tuning configuration on AIX systems. Increase the space allocated for ARG/ENV list to 128. The size is specified by number of 4K blocks. For example:/usr/sbin/chdev -l sys0 -a ncargs='1024' Parent topic: Tuning AIX System Environment