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SAP	
  Rolling	
  Kernel	
  Switch	
  
•  The  Rolling  Kernel  Switch  (RKS)  can  be  used  to  minimize  the  
planned  down;me  in  high  availability  systems  in  order  to  
implement  a  new  kernel  patch  level
•  This  document  focuses  on  the  manual  RKS  available  for  72x  
releases  of  SAP  NetWeaver
•  The  document  is  aimed  at  system  administrators  responsible  
for  upgrading  the  kernel  of  SAP  NetWeaver  systems  opera;ng  
the  721  kernel
Introduc5on	
  
•  Applica;on  severs  of  the  system  being  patched  must  operate  
temporarily  with  a  different  kernel  version
•  The  kernel  versions  in  ques;on  must  be  compa;ble  –  i.e.  the  
old  kernel  must  be  able  to  operate  alongside  the  new  kernel  in  
the  same  SAP  system
•  The  system  is  a  high  availability  system  with  clustered  central  
services  (SCS)  and  associated  replicated  enqueue  managed  by  
an  enqueue  replica;on  server  (ERS)
Pre-­‐Requisites	
  
Prepara5ons	
  
•  Download  and  extract  the  new  kernel  to  your  soPware  
repository
•  Prepare  the  SCS  for  RKS  –  copy  the  extracted  “StoC.xml”  file  to  
the  directory  of  the  SCS  instance  denoted  by  system  parameter  
$DIR_HOME
•  Use  “sapcontrol  -­‐nr  00  -­‐func;on  ParameterValue  DIR_HOME  |  
tail  -­‐1”  to  determine  this  loca;on  if  you’re  not  sure
•  Physically  switch  in  the  new  kernel  by  copying  the  newly  
prepared  kernel  into  the  /sapmnt/<SID>  file  system
Performing	
  the	
  RKS	
  
•  RKS  for  each  SAP  instance  comprises  the  following  steps
•  Prepare  the  instance
–  Isolate  the  instance  from  any  processing
–  Prevent  direct  logon,  background  processing,  spooling  etc.
–  Protect  the  transport  system  –  adjust  communica;on  system  in  TMS
•  Restart  the  isolated  instance
–  sapcpe  will  copy  the  new  kernel  from  /sapmnt/<SID>/exe  to  the  instance  
executable  dircetory
•  Execute  saproot.sh  as  root
•  Ac;vate  the  instance
–  Reverse  all  the  isola;on  steps  above
Monitoring	
  the	
  RKS	
  
•  The  RKS  can  
be  monitored  
in  SM51
•  When  all  applica;on  instances  have  been  restarted,  the  
dormant  ERS  should  be  restarted,  the  SCS  cluster  failed  over  
and  the  remaining  dormant  ERS  restarted
Performing	
  the	
  RKS	
  on	
  SCS	
  
Thank-­‐you	
  

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Guide Rolling Kernel Switch SAP NetWeaver Systems

  • 2. •  The  Rolling  Kernel  Switch  (RKS)  can  be  used  to  minimize  the   planned  down;me  in  high  availability  systems  in  order  to   implement  a  new  kernel  patch  level •  This  document  focuses  on  the  manual  RKS  available  for  72x   releases  of  SAP  NetWeaver •  The  document  is  aimed  at  system  administrators  responsible   for  upgrading  the  kernel  of  SAP  NetWeaver  systems  opera;ng   the  721  kernel Introduc5on  
  • 3. •  Applica;on  severs  of  the  system  being  patched  must  operate   temporarily  with  a  different  kernel  version •  The  kernel  versions  in  ques;on  must  be  compa;ble  –  i.e.  the   old  kernel  must  be  able  to  operate  alongside  the  new  kernel  in   the  same  SAP  system •  The  system  is  a  high  availability  system  with  clustered  central   services  (SCS)  and  associated  replicated  enqueue  managed  by   an  enqueue  replica;on  server  (ERS) Pre-­‐Requisites  
  • 4. Prepara5ons   •  Download  and  extract  the  new  kernel  to  your  soPware   repository •  Prepare  the  SCS  for  RKS  –  copy  the  extracted  “StoC.xml”  file  to   the  directory  of  the  SCS  instance  denoted  by  system  parameter   $DIR_HOME •  Use  “sapcontrol  -­‐nr  00  -­‐func;on  ParameterValue  DIR_HOME  |   tail  -­‐1”  to  determine  this  loca;on  if  you’re  not  sure •  Physically  switch  in  the  new  kernel  by  copying  the  newly   prepared  kernel  into  the  /sapmnt/<SID>  file  system
  • 5. Performing  the  RKS   •  RKS  for  each  SAP  instance  comprises  the  following  steps •  Prepare  the  instance –  Isolate  the  instance  from  any  processing –  Prevent  direct  logon,  background  processing,  spooling  etc. –  Protect  the  transport  system  –  adjust  communica;on  system  in  TMS •  Restart  the  isolated  instance –  sapcpe  will  copy  the  new  kernel  from  /sapmnt/<SID>/exe  to  the  instance   executable  dircetory •  Execute  saproot.sh  as  root •  Ac;vate  the  instance –  Reverse  all  the  isola;on  steps  above
  • 6. Monitoring  the  RKS   •  The  RKS  can   be  monitored   in  SM51
  • 7. •  When  all  applica;on  instances  have  been  restarted,  the   dormant  ERS  should  be  restarted,  the  SCS  cluster  failed  over   and  the  remaining  dormant  ERS  restarted Performing  the  RKS  on  SCS