VM66353: UNABLE TO INITIALIZE VALID EDEVICE PATHS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Memory allocated for the subchannel ID within the SCSI-FCP
  adapter driver needs to have its reserved bits explicitly
  cleared for proper initialization. By not doing so, we run the
  risk of having the subchannel ID corrupted before being used to
  address the signal adapter instruction. This problem appears
  infrequent but has recently occurred with greater regularity
  particularly on the z15, with the result being a timeout of the
  I/O operations necessary for bringing the associated EDEVice
  paths online
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of EDEVICEs                        *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  The data area constructed to store the subchannel ID within the
  SCSI-FCP adapter driver is initialized incorrectly. The reserved
  fields need to be explicitly set to zero, otherwise the
  subchannel ID has the potential to become corrupted. If a
  corrupted subchannel ID is passed to the hardware adapter during
  path initialization, the associated IO command times out and
  path initialization fails.
  

Problem conclusion

• Explicitly clear the reserved fields of the data area
  constructed to store the subchannel ID.
  

Temporary fix

• FOR RELEASE VM/ESA CP/ESA R640 :
  PREREQ: VM66095 VM66247
  CO-REQ: NONE
  IF-REQ: NONE
  FOR RELEASE VM/ESACP/ESAR710 :
  PREREQ: VM66247
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

APAR Information

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

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

  UM35594 UM35595

Modules/Macros

• HCPSZN   HCPSZQ
  

Fix information

• Fixed component name

  VM CP

• Fixed component ID

  568411202

Applicable component levels

• R640 PSY UM35594

     UP20/02/19 P 2001 ¢

• R710 PSY UM35595

     UP20/02/19 P 2101 ¢

Fix is available

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