Live Discovery Patterns for Storage Migrations

Discovery commands for storage migration planning

When planning to move disks between systems (ZFS → Ceph, decommission, etc.), always run these live first:

Ceph OSD Discovery

# Full OSD info
ceph osd tree
ceph osd df

# Single OSD metadata (shows device path, size, rotational, hostname)
ceph osd metadata osd.N --conf /etc/pve/ceph.conf --keyring /etc/pve/priv/ceph.client.admin.keyring

# Device path tells you if disk is USB-backed:
# USB: "/dev/disk/by-path/pci-*usb-*"
# Native SATA: "/dev/disk/by-path/pci-*ata-*"
# NVMe: "/dev/disk/by-path/pci-*nvme-*"

# Pool-to-Crush-Rule mapping
ceph osd pool ls detail | grep -E "pool_name|crush_rule"

ZFS Discovery

zpool status          # Which disks are members?
zpool list            # Capacity info
zfs list              # Datasets and usage

Smart Health

smartctl -a /dev/sdX | grep -E "Model|Serial|Rotation|Reallocated|Power_On|Temp"

Ceph Pool Details (from session 2026-07-03)

Pool	Rule	Size	Applied To
cephfs_data	replicated_rule (host)	3	CephFS
cephfs_metadata	replicated_ssd (host)	3	CephFS meta
vm_disks	replicated_ssd (host)	3	VM disks
rbd	replicated_hdd (host)	3	RBD
hdd_disk	replicated_hdd (host)	3	General storage
tm_disks	replicated_hdd (host)	2	TimeMachine

CRUSH rules: replicated_rule = default (host), replicated_ssd = SSD-only, replicated_hdd = HDD-only.

Ceph Version

Squid 19.2.4 (stable), on Proxmox VE cluster "pve" with nodes proxmox3-7 + n5pro.

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