Why we stopped trusting our own checksums

ByDHDag Holleran

A checksum computed on the way in and never recomputed is a spelling test you mark yourself. What we changed, and what it cost in write latency.

We deleted a production bucket on purpose

ByMOMareth Okonjo

Sixty-one minutes from the delete call to a verified restore, with the timings and the two steps that ran slower than the runbook said.

Cold storage is not cheap storage

BySRSiv Rantala

The retrieval bill is the one nobody models. Four workloads, and four different answers to whether cold is worth it.

Reading a Ledger proof by hand

ByDHDag Holleran

The proof is 640 bytes. This walks every field of one and says what each field rules out.

Erasure coding, explained with a filing cabinet

BySRSiv Rantala

The mental model we used before the v3.2 rewrite changed what it has to teach.

Superseded by → Erasure coding, after the v3.2 rewrite

How Brevick Clearing kept eleven years of trade records

ByIBIlka Brennan

Eleven years, four regulators and one migration off tape, written up with their infrastructure lead.