IV49911: EXTENDLV FAILS DUE TO ALLOCP CHOOSING IN-USE PPS APPLIES TO AIX 7100-03

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• extendlv command fails with the below error even though
  VG has lot of free PPs.
  
  #extendlv exlv 192
  0516-032 lextendlv: Illegal physical partition number.
  0516-788 extendlv: Unable to extend logical volume.
  
  From the lslv output, its seen that the LV exlv belongs
  to hdisk1.
  
  # lslv -m exlv
  exlv:N/A
  LP    PP1  PV1              PP2  PV2           PP3  PV3
  0001  0193 hdisk1
  0002  0194 hdisk1
  0003  0195 hdisk1
  0004  0196 hdisk1
  0005  0197 hdisk1
  
  The lspv -M hdisk1 output, shows that hdisk1  has
  enough PPs for extending the LV exlv.
  
  # lspv -M hdisk1
  hdisk1:1        tmplv:1
  hdisk1:2        tmplv:2
  hdisk1:3        tmplv:3
  hdisk1:4        tmplv:4
  hdisk1:5        tmplv:5
  hdisk1:6-192  ----> Not enough PPs here
  hdisk1:193      exlv:1
  hdisk1:194      exlv:2
  hdisk1:195      exlv:3
  hdisk1:196      exlv:4
  hdisk1:197      exlv:5
  hdisk1:198-384  ----> Not enough PPs here
  hdisk1:385      tmplv:6
  hdisk1:386      tmplv:7
  hdisk1:387      tmplv:8
  hdisk1:388      tmplv:9
  hdisk1:389      tmplv:10
  hdisk1:390-959  ----> Lot of contiguous free PPs.
  
  extendlv looks for the available contiguous free PP pools
  in all the PVs. Then it chooses the best free pool of
  required free PPs. In this case, the required free PPs is
  only 192. Though there are 570 contiguous free PPs
  available, extendlv fails with the above error.
  

Local fix

Problem summary

• If an LV has enough contiguous space for an extendlv operation
  on one disk, but not the other disk(s) in the VG, a logic error
  in the code can mistakenly select one of the other disks and
  try to allocate the partitions from it, causing extendlv to
  fail.
  

Problem conclusion

• Correct logic error in the allocator to sucessfully extendlv
  in this case.
  

Temporary fix

Comments

• 6100-07 - use AIX APAR IV48755
  6100-08 - use AIX APAR IV57806
  6100-09 - use AIX APAR IV50104
  6100-09 - use AIX APAR IV50104
  6100-09 - use AIX APAR IV50104
  7100-01 - use AIX APAR IV57504
  7100-02 - use AIX APAR IV56954
  7100-03 - use AIX APAR IV49911
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IV48755

• 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 U859005

     UP14/05/22 I 1000

PTF to Fileset Mapping

• U859005 bos.rte.lvm 7.1.3.15