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arkk

NAS and RAID storage server, physically located in the home office alongside pyrite.

Status: RECOVERING — array assembled degraded (4/5 disks), rescue backup to pyrite complete and verified (1.4T). Ready to resilver the replacement drive (ZGY9V4AT) — see RAID_RECOVERY_2026.md.

Hardware

Form factor: dish rack, top level
CPU: AMD A8-3870 APU with Radeon HD Graphics
RAM: 8 GB Corsair Vengeance 1333 MT/s (4 x 2GB) Storage (RAID array): - 5 × 4 TB Seagate IronWolf (MN: ST4000VN008-2DR1) via mdadm (RAID5, /dev/md0, xfs) - Active members: ZGY8RDRE, ZGY8S00W, ZGY8RLDM, ZGY8NY0Q - Failed: ZGY8RFGN (slot 3) - Replacement: ZGY9V4AT (installed; currently a spare — not yet resilvered) - Current state: degraded [UUU_U] (4/5), assembled read-only for rescue backup

OS: Ubuntu Server 20.04.6 LTS
Network: - LAN gigabit Ethernet (10.1.10.201) - Direct bonded dual-gigabit link to pyrite: bond0 = 192.168.2.1 (arkk) ↔ 192.168.2.2 (pyrite); ~200 MB/s iperf - NFS: /mnt/arkk exported read-only to 192.168.2.2 during recovery - TODO: Tailscale client when operational

Role

  • Primary backup target for gatekeeper databases and application data
  • Primary backup target for pyrite documents, photos, and project files
  • NFS server: exposes storage to pyrite over the direct bonded link
  • Offsite backup staging point (future: restic → cloud)

Recovery Status

  • [x] Replacement drive installed (ZGY9V4AT, present as spare sda1)
  • [x] Array assembled degraded (4/5) and mounted read-only
  • [x] NFS export re-established to pyrite (read-only, bonded link)
  • [x] Selective rescue backup to pyrite complete and verified (1.4T to /mnt/glass)
  • [ ] Spare re-added; RAID resilvering complete
  • [ ] Array remounted read-write; NFS exports restored to normal
  • [ ] Backup jobs re-pointed to arkk
  • [ ] Tailscale client reconnected

Network (current)

Interface Address Notes
LAN 10.1.10.201 Router-connected, SSH access
bond0 192.168.2.1/24 Direct bonded link to pyrite (192.168.2.2)
Tailscale TBD Reconnect after recovery

NFS Exports

During recovery: /mnt/arkk exported read-only to 192.168.2.2 (pyrite) over the bonded link. Normal (post-recovery) exports TBD when the array is remounted read-write.

Recovery Tools

Rescue backup scripts

The 2026 rescue backup runs from pyrite against the NFS mount. Scripts and selection lists live in the scripts/ directory alongside this page:

  • run_backup.sh — orchestrates both passes with logging and preflight checks
  • rsync_selected_from_arkk.sh + targets.txt / excludes.txt — bulk selective copy
  • thin_checkpoints_from_arkk.sh + checkpoint_dirs.txt — thinned GAN checkpoint ladder
cd ~/homelab/docs/machines/arkk/scripts
./run_backup.sh -s /mnt/arkk -d /mnt/glass/arkk -n   # dry run
./run_backup.sh -s /mnt/arkk -d /mnt/glass/arkk      # real run

See BACKUP_TRIAGE_2026.md for the full keep/drop plan and run procedure.

See also