DWW0638I An I⁄O error occurred after a get request to the aaaa data set. The XRBA=bbbbbbbb. VSAM return codes are R15=cc, FDBK=dd.

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An attempt to get a record from data set aaaa failed because of an I⁄O error. bbbbbbbb is the relative byte address of the record to be processed when the I⁄O error occurred. cc is the return code in register 15, and dd is the value of the feedback field in the request parameter list (RPL).

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Some VSAM errors might be followed by another message in the range DWW0210–DWW0212. These messages show the system action and indicate that CICS® VR will terminate.

Other VSAM errors will not be followed by another message because they are acceptable for:
  • The backup-while-open facility, where the updates are in progress while the backup is being made.
  • VSAM data sets updated on pre-CICS/ESA 4.1 systems, where the after-image is written to the log before being applied to the VSAM data set.
  • Data set updates that were logged but not yet applied to the VSAM data set
For an explanation of the codes in this message, see z/OS DFSMS Macro Instructions for Data Sets .

Also see CICS VR Implementation Guide and Reference for more information about acceptable VSAM errors.

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None.