While performing a takeover (for example, fallover to the next priority node), PowerHA  SystemMirror tries to perform some operations (DLPAR or adjust the CoD and EPCoD  resources) in parallel to the release of resources on the source node and the acquisition of  resources on target node if the user allows it in the tunables (the value of  Force synchronous  release of DLPAR resources  is  No ).  Table 6-15 shows the testing results of the DLPAR operation. The result might be different in  other environments, particularly if the resource is being used. There is one LPAR. Its current running CPU resource size is 2C, and the running memory  resource size is 8 GB. The DLPAR operation includes add and remove. ProbeVue is a dynamic tracing facility of AIX. You can use it for both performance analysis  and problem debugging. ProbeVue uses the Vue programming language to dynamically  specify trace points and provide the actions to run at the specified trace points. This feature is  enabled by default. There is one restriction regarding ProbeVue’s maximum pinned memory  and DLPAR remove memory operation: The Max Pinned Memory For ProbeVue tunable  cannot  cross the 40% limit of system running memory. For example, you configure one profile for an LPAR with 8 GB (minimum) and 40 GB  (wanted). When you activate this LPAR, the maximum pinned memory of ProbVue is set to  4 GB (10% of system running memory), as shown in Example 6-5.  From AIX 7.1 TL4 onward, the tunables are derived based on the available system memory.  The maximum pinned memory is set to 10% of the system memory. It cannot be adjusted  when you restart the operating system or adjust the memory size with the DLPAR operation. Now, if you want to reduce the memory 40 - 8 GB, run the following command: The command fails with the error that is shown in Example 6-6 on page 195. 194  IBM PowerHA SystemMirror V7.2.3 for IBM AIX and V7.2.2 for Linux Example 6-5 Current maximum pinned memory for ProbeVue Table 6-15 Elapsed time of the DLPAR operation Incremental value  By DLPAR Add CPU (in seconds) Add memory (in seconds) Remove CPU (in seconds) Remove memory (in minutes and  seconds) 2C and 8 GB 5.5 s 8 s 6 s 88 s (1 m 28 s) 4C and 16 GB 7 s 12 s 9.8 s 149 s (2 m 29 s) 8C and 32 GB 13 s 27 s 23 s 275 s (4 m 35 s) 16C and 64 GB 18 s 34 s 33 s 526 s (8 m 46 s) 32C and 128 GB 24 s 75 s 52 s 1010 s (16 m 50 s) 48C and 192 GB 41 s 179 s 87 s 1480 s (24 m 40 s) AIX ProbeVue maximum pinned memory setting # probevctrl -l Probevue Features: on --> ProbeVue is enabled at this time MAX pinned memory for Probevue framework(in MB): 4096 --> this is the value that  we are discussing ... chhwres -r mem -m r1r9m1-9117-MMD-1038B9P -o r -p ITSO_S2Node1 -q 32768