Why Websphere MQ cannot create a lock when trying to open a file in RO mode on an NFS share from NetApp?

Solution Unverified - Updated -

Issue

  • Websphere MQ cannot create a lock when trying to open a file in RO mode on an NFS share from NetApp, lock create fails with the following in strace
 11:13:24 open("/var/WMQ/iti/QMDATA/ITI!SWIFT!GTY!QM01/qmstatus.ini", O_RDONLY) = 3 <0.000607>
 11:13:24 fcntl(3, F_GETFL)              = 0x8000 (flags O_RDONLY|O_LARGEFILE) <0.000017>
 11:13:24 fcntl(3, F_SETFL, O_RDONLY|O_DSYNC|O_LARGEFILE) = 0 <0.000016>
 11:13:24 fcntl(3, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=0, len=0}) = 0 <0.000796>

Environment

  • Red Hat Enterprise Linux (RHEL) 6
  • NetApp
  • NFSv4
  • Websphere MQ

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