VM66675: SUPPORT LARGE NVME EDEVICE PAGE SPACE ALLOCATIONS

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• Allow paging space to be allocated anywhere on an NVMe EDEVICE
  and to be of any size up to the available capacity.
  Removes the 'below 64G' restriction for PAGE allocations on
  NVMe EDEVICEs.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users exploiting NVMe EDEVICEs for paging.   *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  Paging allocations on NVMe EDEVICEs were limited to 64G, which
  prevented the full benefit this technology could provide from
  being realized. This new function allows paging allocations to
  be defined as large as the EDEVICE capacity (typically close to
  1 terabyte) using the CPFMTXA utility. CPFMTXA allocation has
  been enhanced for FBA devices and EDEVICEs to permit the size of
  an extent to be specified in megabytes, gigabytes, or terabytes
  (e.g., "PAGE 1T") and to adjust its boundaries automatically.
  ICKDSF APAR PH52513 (PTF UI92308) is required to support larger
  allocations.
  An additional fix checks the formatted block size of the NVMe
  SSD and the initial SET EDEVICE command fails with a new variant
  of message HCP377E if it is not 512 bytes.
  Further fixes address potential problems with very high activity
  rates and with missing interruptions. If a missing interruption
  is detected, the following new message will be reported to the
  system operator:
       HCP1162I Active missing interrupt remediation
                initiated for PCI function rpfid.
  If the condition clears, the system operator will receive this
  message:
       HCP1162I Active missing interrupt remediation
                terminated for PCI function rpfid.
  

Problem conclusion

Temporary fix

• FOR RELEASE VM/ESA CP/ESA R730 :
  PREREQ: VM66434 VM66665 VM66622
  CO-REQ: NONE
  IF-REQ: NONE
  

Comments

• z/VM: CP Commands and Utilities Reference
  Form number SC24-6268-73
  
  CPFMTXA HELPCP has been updated to document the new FBA
  allocation syntax and to provide examples of using it.
  
  z/VM: CP Messages and Codes
  Form number GC24-6270-73
  
  HCP377E HELPMSG has been updated to document the new variant of
  this message.
  HCP1162I HELPMSG has been created to document two variants of
  this new message.
  

APAR Information

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

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

  UM90336

Modules/Macros

• CPFMTXA  CPLOAD   HCPDVT   HCPMDLAT HCPMES   HCPMESB  HCPMXRBK
  HCPNVM   HCPNVME  HCPPCH   HCPPCI   HCPRDX   HCP1162I HCP377E
  VRDCBLOK
  

Fix information

• Fixed component name

  VM CP CP

• Fixed component ID

  568411202

Applicable component levels

• R730 PSY UM90336

     UP23/08/21 P 2401  

Fix is available

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