APAR status
Closed as documentation error.
Error description
The new POWER8 based Enterprise machines E870 and E880 can support large numbers of CPU cores and LPAR sizes. . POWER8 LPARs running AIX 6 TL9 SP4 and AIX 7 TL3 SP4 by default are SMT=4 (Like POWER7/7+) as the IBM policy is not to catch out a customer by invisibly switching on new features. The POWER8 processor supports the higher Simultaneous Multiple Threading with 8 threads at a time (SMT=8). . Before switching a large LPAR (48 or higher Dedicated or Shared Processor cores) to SMT=8, do the following: # probevctrl -c trace=off # bosboot -a . Now you can temporarily switch to SMT=8 immediately, as the root user, with: # smtctl -t 8 -w now When the LPAR reboots or system is rebooted it will return to SMT=4 or you can use smtctl to immediately set lower SMT numbers like 1, 2 or 4. . Or make the change now and permanently across LPAR reboots or system reboots, as the root user, with: # smtctl -t 8 -w now # bosboot -a . It is planned for future releases of AIX in 2015, that the management of the probevctrl command will be optimized automatically.
Local fix
Problem summary
Method do change to SMT8 was unclear
Problem conclusion
Document the method above
Temporary fix
Comments
APAR Information
APAR number
IV68445
Reported component name
AIX V7.1
Reported component ID
5765H4000
Reported release
710
Status
CLOSED DOC
PE
NoPE
HIPER
NoHIPER
Submitted date
2015-01-09
Closed date
2015-01-09
Last modified date
2015-01-09
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Applicable component levels
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSMV87","label":"AIX 6.1 Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSMVAX","label":"AIX Express Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11R","label":"AIX 7.1 HIPERS, APARs and Fixes"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"","label":""}}]
Document Information
Modified date:
09 January 2015