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IV62992: CHANGE DEFAULT FALLBACK NFS TCP SOCKETSIZE VALUE APPLIES TO AIX 7100-03

A fix is available

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • When the sb_max setting is changed to less than 600000,
    the
    NFS socket falls back to the default value of 61K for the
    socket send/recv sizes. This can cause NFS IO errors when
    using the (default) 64K read/write block sizes.
    
    NFS errors such as the following could be seen:
    
       NFS write error on host abchost.net: 78.
    
    The iptrace data will indicate that there are no NFS IO
    (read/write) calls going over the wire at the time of the
    error.
    

Local fix

  • Either
    - Figure out why we get to fallback socket size
    (maybe sb_max < nfs_tcp_socketsize, isno options)
    ) and correct that
    or
    - Reduce read or write size,
    

Problem summary

  • Writing to a file in NFS FS may fail with error 78 if
    sb_max value is set to less than nfs_tcp_socketsize
    value (provided it is more than the nfs_max_write_size)
    
    The iptrace data will indicate that there are no NFS IO
    (read/write) calls going over the wire at the time of the
    error.
    

Problem conclusion

  • Correct the fallback socketsize value to allow NFS write
    packets of default size to be sent out over the wire.
    

Temporary fix

Comments

  • 6100-08 - use AIX APAR IV62572
    6100-09 - use AIX APAR IV62952
    7100-02 - use AIX APAR IV64295
    7100-03 - use AIX APAR IV62992
    

APAR Information

  • APAR number

    IV62992

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2014-07-28

  • Closed date

    2014-07-28

  • Last modified date

    2016-05-11

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

    IV62572

  • 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 U865826

       UP15/05/19 I 1000

PTF to Fileset Mapping



Document information

More support for: AIX Enterprise Edition

Software version: 710

Operating system(s): AIX

Reference #: IV62992

Modified date: 11 May 2016