PVE root on esh-pve-nas is a USB Disk-on-Module: 6 GB ext4 with the host's only
ESP. A DOM is SLC/pSLC so wear is not the driver -- the problems are that it is
on the USB bus (a reset drops root under a running hypervisor), has no headroom,
and is unmirrored while 928 GB of mirrored NVMe sits 96% empty.
Runbook targets a fresh PVE install to ZFS RAID1 across both NVMes. In-place
conversion is unsupported, and adding an ESP to the existing NVMes is impossible
-- both are whole-disk ZFS members with 1.7 MiB free and proxmox-boot-tool
manages nothing today.
The headline risk is not on the host being rebuilt: CT 103 esh-nas IS the NAS
at 10.0.50.50, and both esh-docker-vm and esh-pve mount it hard. Taking this box
down stalls esh-pve's storage layer and wedges esh-docker-vm into the D-state
whose only remedy is a host reboot -- the incident shape already on record.
Quiescing those clients is step one of the window, and the README now warns
against casual reboots.
Config snapshot captured off-box to nh3-dev (0600) with /etc/pve, network and
fstab config plus zpool/zfs/disk-by-id/guest state; the newest on-disk copy
before this was June 2024.
vh
2275e11be0