> ## Documentation Index
> Fetch the complete documentation index at: https://docs.xloud.tech/llms.txt
> Use this file to discover all available pages before exploring further.

# Instance HA User Guide

> Protect instances from compute host failures using Xloud Instance HA — configure protection policies, monitor recovery status, and validate failover workflows.

<p style={{ fontSize: '1.25rem', fontWeight: 700, marginBottom: '0.75rem' }}>Overview</p>

Xloud Instance HA monitors compute hosts and automatically recovers protected instances
when a host becomes unreachable. As a project member, you configure which instances are
protected and track recovery events through the Dashboard or CLI.

This guide covers protection concepts, assigning policies to instances, and monitoring
ongoing recovery workflows.

<Note>
  Instance HA protection requires your administrator to have configured at least one
  failover segment and host monitor. Contact your administrator if protection policies
  are unavailable in your project. Your administrator can configure this through [XDeploy](/deployment).
</Note>

***

<p style={{ fontSize: '1.25rem', fontWeight: 700, marginBottom: '0.75rem' }}>In This Guide</p>

<CardGroup cols={4}>
  <Card title="How It Works" icon="circle-info" href="/services/instance-ha/user-guide/how-it-works" color="#197560">
    Understand the failover detection and recovery sequence from host failure to instance
    restoration.
  </Card>

  <Card title="Protection Segments" icon="shield-check" href="/services/instance-ha/user-guide/protection-segments" color="#197560">
    Learn what failover segments are and how to view the segments your instances belong to.
  </Card>

  <Card title="Recovery Workflows" icon="rotate" href="/services/instance-ha/user-guide/recovery-workflows" color="#197560">
    Understand the recovery process and the steps involved when an instance is recovered.
  </Card>

  <Card title="Monitoring Status" icon="gauge" href="/services/instance-ha/user-guide/monitoring-status" color="#197560">
    Track notification events, view recovery history, and verify instance protection status.
  </Card>

  <Card title="Troubleshooting" icon="wrench" href="/services/instance-ha/user-guide/troubleshooting" color="#197560">
    Diagnose protection assignment issues, failed recoveries, and notification errors.
  </Card>
</CardGroup>

***

<p style={{ fontSize: '1.25rem', fontWeight: 700, marginBottom: '0.75rem' }}>Key Concepts</p>

<CardGroup cols={4}>
  <Card title="Failover Segment" icon="shield-check" color="#197560">
    A group of compute hosts monitored together as a unit. When a host in a segment
    fails, all protected instances on that host are recovered.
  </Card>

  <Card title="Protection Policy" icon="file-shield" color="#197560">
    Attached to an instance to define its recovery behavior — whether to recover
    automatically and how quickly to begin.
  </Card>

  <Card title="Host Monitor" icon="heart-pulse" color="#197560">
    An agent that continuously checks host availability and triggers the recovery
    engine when a host becomes unreachable.
  </Card>

  <Card title="Recovery Notification" icon="bell" color="#197560">
    An event emitted by the host monitor that initiates the recovery workflow for
    all protected instances on the failed host.
  </Card>
</CardGroup>

***

<p style={{ fontSize: '1.25rem', fontWeight: 700, marginBottom: '0.75rem' }}>Next Steps</p>

<CardGroup cols={4}>
  <Card title="Instance HA Admin Guide" icon="shield-check" href="/services/instance-ha/admin-guide" color="#197560">
    Configure failover segments, host monitors, and recovery policies platform-wide.
  </Card>

  <Card title="Instance HA Overview" icon="layers" href="/services/instance-ha/index" color="#197560">
    Service overview, feature summary, and getting started with Instance HA.
  </Card>
</CardGroup>