How does disk expansion work on ONTAP system?

• Disk expansion on NetApp ONTAP systems is an online operation used to increase aggregate capacity by adding physical disks.
• System shutdown is not required, and client access remains available during the operation.
• Expected behavior and duration
  • Disk add operation:
    • Typically completes in approximately 1 hour
    • Duration varies based on:
      • Number of disks added
      • Aggregate layout
      • System workload
  • Background processing:
    • RAID parity recalculation and reconstruction start automatically
    • May run for several hours or longer
    • Runs in the background without interrupting client access
  • Note:
    • Background RAID activity may continue after the disk add command completes
    • Performance impact is usually minimal but workload dependent
• Disk expansion procedure
  1. Verify current system state
     • Review capacity and usage for:
       • Disks
       • Aggregates
       • Volumes
       • Qtrees
  2. Add disks to the aggregate
     • Install physical disks if not already present
     • Add disks using the ONTAP command line interface (CLI)

storage aggregate add-disks -aggregate <aggregate_name> -diskcount <number_of_disks>

• • • RAID group balance is automatically managed by ONTAP
• Operational checks
  • Pre checks
    • Confirm aggregate capacity and utilization
    • Verify system health status
  • During expansion
    • Monitor for system errors or warnings
    • Observe RAID reconstruction activity
  • Post checks
    • Confirm aggregate capacity increase
    • Verify quota configuration if applicable
    • Confirm no active alerts or service impact

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