A fix is available
APAR status
Closed as program error.
Error description
CPUs disappear from the output of sar -PALL.In that case, physc of "-", which means an entire system, goes up in spite of no loads on all CPUs which are shown in sar. # sar -P ALL 1 10 AIX xv750h 1 7 00F605844C00 09/12/14 System configuration: lcpu=8 ent=0.50 mode=Uncapped 19:15:54 cpu %usr %sys %wio %idle physc %entc 19:15:55 0 17 56 0 27 0.00 0.8 1 0 7 0 93 0.00 0.3 2 0 8 0 92 0.00 0.3 3 0 6 0 94 0.00 0.3 4 0 0 0 100 0.12 23.1 5 0 0 0 100 0.12 23.6 6 0 0 0 100 0.12 24.8 7 100 0 0 0 0.40 80.5 << Heavy load on CPU7. - 53 0 0 46 0.77 153.6 19:15:56 0 12 59 0 28 0.00 0.8 1 0 4 0 96 0.00 0.3 2 0 8 0 92 0.00 0.3 3 0 5 0 95 0.00 0.3 4 0 48 0 52 0.00 0.1 5 0 20 0 80 0.00 0.1 6 0 4 0 96 0.00 0.1 U - - 0 98 0.49 98.1 << No load on CPU7, so CPU7 disappears. - 0 1 0 99 0.01 1.9 << And physc of global('-') goes down. 19:15:57 0 11 59 0 30 0.00 0.7 1 0 5 0 95 0.00 0.3 2 0 6 0 94 0.00 0.3 3 0 7 0 93 0.00 0.3 4 0 1 0 99 0.02 5.0 U - - 0 83 0.40 80.1 - 13 0 0 86 0.10 19.9 19:15:58 0 11 58 0 32 0.00 0.7 1 0 6 0 94 0.00 0.3 2 0 11 0 89 0.00 0.3 3 0 6 0 94 0.00 0.3 4 0 0 0 100 0.17 33.7 - 49 0 0 51 0.84 168.6 << No load on all CPUs but physc('-') goes up. CPU7 should have the high load due by the test program, but it doesn't show up in sar's output. Then, just physc of ('-') goes up in spite of no loads on all CPUs which are shown in sar at 19:15:58.
Local fix
use mpstat command instead of sar.
Problem summary
In sar output,if a CPU's output disappears because of no load, then it would never appear in the output again even though you put load on it.
Problem conclusion
Appropriate code changes so that in sar output,if CPU disappears because of no load,now it will appear in the output again in case of load on that CPU again.
Temporary fix
Comments
6100-08 - use AIX APAR IV70053 6100-09 - use AIX APAR IV68366 7100-02 - use AIX APAR IV70205 7100-03 - use AIX APAR IV66630 7100-03 - use AIX APAR IV66630
APAR Information
APAR number
IV66630
Reported component name
AIX V7.1
Reported component ID
5765H4000
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2014-11-06
Closed date
2015-01-07
Last modified date
2015-09-30
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX V7.1
Fixed component ID
5765H4000
Applicable component levels
R710 PSY U865829
UP15/05/19 I 1000
PTF to Fileset Mapping
U865829 bos.acct 7.1.3.45
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Document Information
Modified date:
30 September 2015