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IV50104: EXTENDLV FAILS DUE TO ALLOCP CHOOSING IN-USE PPS APPLIES TO AIX 6100-09

A fix is available

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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 number

    IV50104

  • Reported component name

    AIX 610 STD EDI

  • Reported component ID

    5765G6200

  • Reported release

    610

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2013-09-27

  • Closed date

    2013-09-27

  • Last modified date

    2014-08-14

  • 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 610 STD EDI

  • Fixed component ID

    5765G6200

Applicable component levels

  • R610 PSY U859282

       UP14/05/21 I 1000

PTF to Fileset Mapping



Document information

More support for: AIX Enterprise Edition

Software version: 610

Operating system(s): AIX

Reference #: IV50104

Modified date: 14 August 2014