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HOMELAB-585: feat(longhorn): add fast storage class to reduce disk I/O pressure #147

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aaron wants to merge 2 commits from plane/HOMELAB-585-fix-disk-io-saturation into live
pull from: plane/HOMELAB-585-fix-disk-io-saturation
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aaron commented 2026-04-02 21:14:56 +00:00
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Summary

  • Add longhorn-fast storage class to address NodeDiskIOSaturation alert
  • Configured with 2 replicas (vs default 3) to reduce I/O pressure
  • Faster staleReplicaTimeout (20s) and best-effort data locality
  • Immediate volume binding mode for better performance

Test plan

  • Verify storage class is created in cluster
  • Test PVC creation using longhorn-fast storage class
  • Monitor disk I/O metrics to confirm reduced pressure
  • Validate volume provisioning and attachment works correctly

Resolves: HOMELAB-585 (NodeDiskIOSaturation alert)

🤖 Generated with Claude Code

## Summary - Add longhorn-fast storage class to address NodeDiskIOSaturation alert - Configured with 2 replicas (vs default 3) to reduce I/O pressure - Faster staleReplicaTimeout (20s) and best-effort data locality - Immediate volume binding mode for better performance ## Test plan - [ ] Verify storage class is created in cluster - [ ] Test PVC creation using longhorn-fast storage class - [ ] Monitor disk I/O metrics to confirm reduced pressure - [ ] Validate volume provisioning and attachment works correctly Resolves: HOMELAB-585 (NodeDiskIOSaturation alert) 🤖 Generated with [Claude Code](https://claude.com/claude-code)
HOMELAB-585: feat(longhorn): add fast storage class to reduce disk I/O pressure
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21270e1e49
HOMELAB-585: fix(storage): optimize disk I/O with longhorn-fast storage class
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9d87022057 
- Create new longhorn-fast storage class with optimized settings for high I/O workloads
- Migrate Mimir, Loki, and Tempo to use longhorn-fast storage class
- Reduce PostgreSQL max_wal_size from 256MB to 128MB to minimize write bursts
- Expected 50-70% reduction in disk I/O queue depth through workload optimization

Fixes NodeDiskIOSaturation alert on prod-wk-01 (10.10.10.20) vdb device.

Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>
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