SLA: design in São Paulo (GRU) · S-61

Runbook S-61 for SLA in São Paulo (GRU). Marker xserv-s-dcdfbb499ffe. This page covers design for LATAM operators, not a worldwide average.

SLA: Why it matters on this continent

Design for SLA on letter S starts in São Paulo (GRU). Runbook s-01 keeps a single owner, a written rollback, and a traffic split that can be reversed without a global freeze. Neighbors in Santiago only take overflow after the local pool fails a health window.

SLA: How XServ runs it day to day

Probes for SLA (s-02) leave Santiago every 15s toward Bogotá. XServ pages the named owner if loss or RTT crosses the letter budget. A probe never shares a queue with bulk transfers, so a saturated WAN does not hide a dead PoP.

SLA: What operators should measure

Policy for SLA is versioned as s-03. Operators measure error rate, p95 from Bogotá, and time-to-rollback — not a worldwide average. Changes land in Bogotá first, then Miami, with a hold if either region regresses.

SLA peering S-07

Peering for SLA (s-07) prefers the IX fabric that already carries last-mile ISPs in Bogotá. Session counts and prefix limits are on the same page as the Miami backup path.

SLA cache S-08

Cache rules for SLA on s-08 keep language-correct objects near Miami. São Paulo is a sibling cache, not an origin. TTLs are short enough that a bad asset does not live through a weekend.

SLA headers S-09

Headers for s-09 carry the letter, the region (GRU) and a request id. SLA debugging in São Paulo should not require a packet capture in Santiago first.

SLA timeouts S-10

Timeouts on s-10 are tighter than the WAN RTT to Bogotá. SLA in Santiago fails fast and retries once; a third try needs a human because it is no longer a blip.