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Aggregate Offline: Volumes Are Unavailable
An aggregate/local tier is offline and its volumes are unavailable, often after power, disk, shelf, or HA disruption.
What ONTAP is telling you
Offline is an aggregate state, not a root cause. Aggregate status, RAID state, disk ownership/failure, shelf health, and HA ownership determine whether a normal online operation is appropriate or unsafe.
How to confirm
storage aggregate show -aggregate <aggregate> -instance
storage aggregate show-status -aggregate <aggregate>
storage disk show -broken
storage disk show -fields disk,state,owner,home,container-type
storage shelf show -errors
storage failover show
event log show -time >1h -severity ERROROutput shape: Aggregate output gives state and ownership; show-status gives RAID groups/disks; disk and shelf views expose broken/missing hardware; HA output shows takeover/giveback ownership. Capture all before changing state.
The fix
If disks, shelves, ownership, and HA state are healthy and the aggregate is simply offline, use storage aggregate online -aggregate <aggregate>, then verify aggregate and volume state. If it is failed/degraded, disks are missing, or ownership is unclear, stop and engage NetApp Support—do not destroy, re-zero, or reassign storage speculatively.
How to prevent it
Monitor disk/shelf and HA health, retain AutoSupport, keep firmware current under the supported process, and use documented power sequencing and clean shutdown procedures.
Sources and version relevance
Commands and claims are limited to material already represented in the Black Box archive. CLI links target the archived ONTAP 9.19.1 reference; fields and availability can differ by release. Check your ONTAP version and on-cluster command ? before production use.
Related Black Box pages: RAID and disks · aggregate capacity · HA pairs · all troubleshooting guides
Related advisory: none identified in the archive for this operational symptom.