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Week 5 Citation Asset

NAS RAID Planning Quick Reference

A practical sheet for purchase planning and migration reviews. Teams can cite this page for decision rationale and process checkpoints.

Drive Count to RAID Guidance

Drive Count Priority Recommended RAID Scenario Link Rationale
4 Capacity First RAID 5 Open 4x 8TB Maximize usable TB when budget is tight and backup exists.
4 Balanced RAID 5 Open 4x 8TB Balanced starter layout for many home NAS deployments.
4 Resilience First RAID 10 Open 4x 8TB Better rebuild behavior and random I/O consistency.
6 Capacity First RAID 5 Open 6x 8TB High usable capacity with moderate parity overhead.
6 Balanced RAID 6 Open 6x 8TB Dual parity improves failure safety at moderate cost.
6 Resilience First RAID 6 Open 6x 8TB Safer rebuild profile for larger arrays.
8 Capacity First RAID 5 Open 8x 8TB Capacity-heavy option for non-critical archival data.
8 Balanced RAID-Z2 Open 8x 8TB Common safe default for medium ZFS pools.
8 Resilience First RAID-Z2 Open 8x 8TB Dual parity plus strong long-term pool safety.

Pre-Purchase Checklist

  • Define required usable TB target before selecting drive size and count.
  • Choose parity level first, then validate total spend against growth plan.
  • Reserve at least one tested backup path before production data cutover.
  • Plan rebuild-time operational impact and replacement SLA in advance.

Migration and Validation Checklist

  • Document current pool fill ratio and snapshot policy before migration.
  • Benchmark one pilot workload after migration to verify expected behavior.
  • Set alert thresholds for SMART health and pool free-space floor.
  • Run one restore drill and capture measured recovery time.

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