jschoubben
e88b448145
Snapshot 9.9s -> 0.13s. Restore 10.4s -> 0.80s. Three snapshots sharing 1.36 GB instead of costing 4.8 GB. The projected four-machine reset cycle falls from ~90s, unbounded at worst, to ~15s dominated by a boot that cannot be avoided. ADR 0029's inner-loop argument holds with copy-on-write and did not without it. The consistency matters as much as the speed: three consecutive snapshots took 0.13, 0.12 and 0.13 seconds, against a dir second snapshot that never finished. One honest counter-observation recorded: launching onto the fresh copy-on-write pool was slower, 20.2s against 14.3s, because the image had to be unpacked into a pool that had never seen it. Paid once per pool, and dwarfed by what snapshotting saves, but it went the other way. Doing the measurement produced the answer to how the lab installs on a clean machine, because both failure modes appeared while doing it. Installed is not available: the daemon was present with units disabled and no group. Issue 007. Available is not adequate, and this is worse: with the storage tooling absent everything worked and snapshots were seventy-six times slower. Nothing failed, nothing warned. That is a variant the mesh has not catalogued — its usual failure is reported success and did nothing; this is reported success and did it seventy-six times slower, which no error surface catches because nothing is wrong. So the lab verifies CAPABILITY, never installation, and refuses to run degraded rather than warning — a warning about a slow inner loop is read once and ignored forever. Prerequisites may arrive from a mesh module or from the lab's own bootstrap, and the second path is required rather than convenient: a lab installable only by a mesh cannot host the development of the mesh that installs it. The lab is the second thing installed by hand, after the node host, and for the same reason: something has to be first, and pretending otherwise produces a circularity papered over by a script nobody exercises.
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03-DESIGN / 01-to-be
The mesh being built toward. Every statement here traces to a record in
02-DECISIONS/; nothing arrives by drafting.
A document here describes an intention. What currently runs is in
00-as-is/, and the two are never merged — when something ships, the as-is
document is written and this one's status becomes implemented.
| Document | Covers | Rests on |
|---|---|---|
00-work-breakdown.md |
How the decomposition gets built, in what order, and where a human must look | ADR 0015 |
01-end-to-end-testing.md |
The lab: a real mesh a change can be run against before it reaches nodes | ADR 0016, 0029 |
02-scenario-declaration.md |
What a scenario declares — the underlay, and what to place on it | ADR 0031 |
03-scenario-lifecycle.md |
What happens to a scenario — raise, snapshot, restore, move, destroy | ADR 0032 |
04-lab-installation.md |
Getting the lab onto a clean machine, and why it verifies capability rather than installation | ADR 0008 |
Not yet written
- The eight bounded contexts. ADR 0015 decides the decomposition; the per-context specifications do not exist yet. The work breakdown says in what order they are needed.
- Domain grouping outside the core. ADR 0017 settles the principle and explicitly does not settle the domain list. That is a research effort, not a design document, until it concludes.