IJ53723: SSD IS INCORRECTLY IDENTIFIED AS HDD

APAR status

• Closed as program error.

Error description

• When create a RG or resize a RG with new IO nodes,  SSDs
  might be identified as HDD incorrectly.
  
  #/usr/lpp/mmfs/bin/mmvdisk rg resize --rg rg_1
  mmvdisk: Obtaining pdisk information for recovery group
  'rg_1'.
  mmvdisk: Analyzing disk topology for node 'node5.com'.
  mmvdisk: Analyzing disk topology for node 'node6.com'.
  mmvdisk: Analyzing disk topology for node 'node7.com'.
  mmvdisk: Validating existing pdisk locations for recovery
  group 'rg_1'.
  mmvdisk: The resized server disk topology is 'ECE 6
  SSD/NVMe and 34 HDD'.
  mmvdisk: Validating declustered arrays for recovery group
  'rg_1'.
  mmvdisk: Adding new pdisks to recovery group 'rg_1'.
  mmvdisk: Successfully resized recovery group 'rg_1'.
  
  # /usr/lpp/mmfs/bin/mmvdisk rg list --da
                  declustered   needs
           capacity             pdisks
  recovery group     array     service  type  BER      trim
   total raw free raw free%  total spare  background task
  --------------  -----------  -------  ----  -------  ----
   --------- -------- -----  ----- -----  ---------------
  rg_1            DA1          no       HDD   enable   no
    1807 TiB  903 TiB   50%    102     2  scrub (0%)
  rg_1            DA2          no       NVMe  enable   no
      75 TiB   60 TiB   80%     12     1  scrub (0%)
  rg_1            DA3          no       HDD   enable   no
    4434 GiB 4434 GiB  100%      6     1  inactive (0%)
  
  
  Reported in: 5.1.9
  

Local fix

Problem summary

• Under certain condition when SED discovery command fails for a
  pdisk with EIO error, in those scenarios hardware type
  information is not set correctly in pdisk. Which results in
  showing SSD disk as HDD.
  

Problem conclusion

• This problem is fixed in 5.1.9.9
  To see all Spectrum Scale APARs and their respective
  Fix solutions refer to page: 
  https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale
  _apars.html
  
  Benefits of the solution:
  Fixed issue where even if SED discovery fails for a disk,
  hardware type information is set correctly.
  
  Work Around:
  None
  
  Problem trigger:
  If SED discovery command fails for a pdisk with EIO error, in
  those scenarios hardware type information is not set correctly
  in pdisk
  
  Symptom:
  Wrong hardware type is set for a disk.
  
  Platforms affected:
  All supported platform
  
  Functional Area affected:
  GNR
  
  Customer Impact:
  severe
  

Temporary fix

Comments

APAR Information

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

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

Fix information

• Fixed component name

  SPEC SCALE DME

• Fixed component ID

  5737F34AP

Applicable component levels