# FAQs

- What Are Regions and AZs?
- How Does CSS Ensure Data and Service Security?
- Which CSS Metrics Should I Focus On?
- What Storage Options Does CSS Provide?
- What Is the Maximum Storage Capacity of CSS?
- What Can the Disk Space of a CSS Cluster Be Used For?
- How Can I Manage CSS?
- Which Elasticsearch Versions Does CSS Support?
- Can CSS Interconnect with Logstash?
- Why Does My ECS Fail to Connect to a Cluster?
- Which Search Functions Does CSS Support?
- Why Does Cluster Creation Fail?
- Why Does Index Backup Fail?
- How Can I Improve Filebeat Performance?
- Failed to Open Kibana