Where is Failover measured first?

From Santiago (SCL) toward Bogotá. A global average is not an SLO for letter F.

How fast is rollback for f-03?

The runbook is a command plus a named owner. There is no wait for a weekly change freeze.

Failover: rollback in Santiago (SCL) · F-54

Runbook F-54 for Failover in Santiago (SCL). Marker xserv-f-04fd41da0a9b. This page covers rollback for LATAM operators, not a worldwide average.

Failover: A note on cost and transit

Rollback for f-06 is a documented command, not a hope. Transit is billed as backup while Failover prefers peering in Santiago. If cost spikes, the runbook cuts overflow to Bogotá before touching customer prefixes.

Failover: Why it matters on this continent

Design for Failover on letter F starts in São Paulo (GRU). Runbook f-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.

Failover: How XServ runs it day to day

Probes for Failover (f-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.

Failover rollback F-06

Failover peering F-07

Peering for Failover (f-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.

Failover cache F-08

Cache rules for Failover on f-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.

Failover headers F-09

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