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How to remove a foreign aggregate (made out of orphaned disks) in ONTAP

Last Updated:

Applies to

  • ONTAP 9
  • Foreign aggregate


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  • Aggregate will report failed and foreign under the aggr status command and EMS may report RAID assimilation failures during reboot/takeover. Example: 

aggr0(1) failed          raid_dp, aggr         diskroot, raidtype=raid_dp, raidsize=24, 
                         foreign               raid_lost_write=on, resyncsnaptime=5, 

[?] Fri Jul 16 06:01:45 CDT [cluster1-01: config_thread: raid.assim.rg.missingChild:debug]: Aggregate partner_foreign:aggr0, rgobj_verify: RAID object 0 has only 5 valid children, expected 10.
[?] Fri Jul 16 06:01:45 CDT [cluster1-01: config_thread: raid.assim.plex.missingChild:debug]: Aggregate partner_foreign:aggr0, plexobj_verify: Plex 0 only has 0 working RAID groups (1 total) and is being taken offline
[?] Fri Jul 16 06:01:45 CDT [cluster1-01: config_thread: raid.assim.mirror.noChild:debug]: Aggregate partner_foreign:aggr0, mirrorobj_verify: No operable plexes found.
[?] Fri Jul 16 06:01:45 CDT [cluster1-01: cf_takeover:]: RAID takeover failed: Partner label processing failed.

  • Event logs can also report raid.assim.tree.multipleRootVols

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