Interim bridge to stop Longhorn replica-rebuild I/O storms on the shared HDD
Storage pool from starving etcd WAL fsync (crash-looping k3s / flapping the
kube-vip VIP). Adds a small dedicated SSD disk per node for etcd only; Longhorn
stays on HDD. See docs/plans/ssd-etcd-isolation.md.
tofu (infra/tofu):
- New vars etcd_ssd_datastore (default "local-zfs" = rpool/data, Micron 5100
SATA SSD mirror w/ PLP) and etcd_disk_gib (default 16).
- New virtio2 disk block on the SSD datastore per VM: discard=on, cache=none
(honor guest fsync straight to the ZFS ZIL — safe on PLP SSD), iothread=false.
Kept last (ascending interface) so bpg does not reorder virtio0/virtio1.
- Revert the debian_cloud_image resource to the long type name
proxmox_virtual_environment_download_file to match the R2 state: bpg >= 0.111
dropped the cross-type moved{} linkage to the short proxmox_download_file, so
the stale moved block failed EVERY plan with "Resource type mismatch" (broken
on main too). Aligning code to state yields a clean plan with no image
re-download. Short-name migration is deferred to a deliberate `tofu state mv`.
ansible (node_baseline):
- Format /dev/vdc (label k3s-etcd) and mount it at
/var/lib/rancher/k3s/server/db (defaults,noatime; no nofail so a missing etcd
disk fails loudly rather than silently landing etcd on the root HDD) before
k3s starts, so a rebuilt node comes up with etcd isolated on SSD. Data-safe:
filesystem module never reformats an existing fs.
Phase 1 only: non-disruptive. No tofu apply, no node/VM/etcd/Longhorn changes.
tofu plan verified: 0 to add, 3 to change, 0 to destroy — every VM an in-place
disk ADD (virtio2), dev-3 also an in-place memory 16384->24576; no VM replace.
Merge gate green (render==golden included).
Co-Authored-By: Claude Opus 4.8 <[email protected]>
jakman85andClaude Opus 4.8
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