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Reconstruction never starts with available spare disk or after failed disk replacement

Last Updated:

Applies to

  • ONTAP 9
  • Data ONTAP 8.x 7-mode
  • Data ONTAP 8.x C-mode
  • Disk Qualification Package (DQP)


  • RAID reconstruction never starts after disk failure with available spare disk or after failed disk replacement.
  • Replaced disk model and character is similar to the failed disk.
  • Replaced disk may show different type or RPM value from the original disk, example:

RAID group /aggr0/plex0/rg1 (degraded, block checksums)

      RAID Disk Device         HA  SHELF BAY CHAN Pool Type  RPM  Used (MB/blks)    Phys (MB/blks)
      --------- ------         ------------- ---- ---- ---- ----- --------------    --------------
      dparity 0a.10.1       0a    21  18  SA:A   0  FSAS  7200 3807816/7798408704 3815447/7814037168
      parity  0a.10.2       0a    20  18  SA:A   0  FSAS  7200 3807816/7798408704 3815447/7814037168
      data    0c.10.3       0c    22  17  SA:B   0  FSAS  7200 3807816/7798408704 3815447/7814037168
      data     FAILED                 N/A                        3807816/ -

spare          0c.10.4        0c    23  1   SA:B   0   SAS 15000 3807816/7798408704 3815447/7814037168

  • EMS log shows the below event:

[nodename: config_check: sas.config.mixed.detected:warning]: SAS shelf "0" attached to adapter "0b" contains a mixture of drive types. Mixed configurations are not supported.

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