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

# Managed Kafka limits and specs

> Regions, broker counts, instance types, storage sizes, retention limits, and account limits for Artie Managed Kafka clusters.

## Regions

| Region | Code |
| - | - |
| US East (N. Virginia) | `us-east-1` |

## Cluster size

| | Limit |
| - | - |
| Brokers | 3 to 30. Brokers can be added, not removed. |
| Replicas per partition | 3 |
| Storage per broker | 20, 50, 80, or 100 to 1,024 GiB. Storage can grow, not shrink. Contact us for more. |
| Storage changes | 3 per 24 hours, at least an hour apart. |

## Instance types

| Family | Instance types | Processor |
| - | - | - |
| Memory optimized | `r8g.large`, `r8g.xlarge`, `r8g.2xlarge` | Graviton (Arm) |
| Memory optimized | `r8i.large`, `r8i.xlarge`, `r8i.2xlarge` | Intel (x86) |
| General purpose | `m8g.xlarge`, `m8g.2xlarge`, `m8g.4xlarge` | Graviton (Arm) |
| General purpose | `m8i.xlarge`, `m8i.2xlarge`, `m8i.4xlarge` | Intel (x86) |

## Retention and tiered storage

| | Limit |
| - | - |
| Days on broker disks | 1 to 14. Defaults to 3. |
| Default retention | 14 days, including topics created automatically on first write. |
| Retention on topics with tiered storage | 1 to 14 days, even while tiered storage is paused. Keeping messages forever isn't available. |
| Largest message | 15 MiB |
| Reserved topics | Kafka's internal `__` topics and `strimzi.cruisecontrol.*` topics can't be changed or deleted. |
| Topics that can use tiered storage | Any topic except compacted topics and Kafka's internal `__` topics. |

## Users and access

| | Limit |
| - | - |
| Users | One `admin` user with access to every topic. Custom users and ACLs aren't available yet. |
| Authentication | SASL/SCRAM-SHA-512 over TLS. |
| Network access | Public address with an IPv4 allowlist. PrivateLink isn't available. |

## Account limits

Each company can have 3 clusters by default, with a monthly spend limit per cluster and across all clusters. Creating a cluster, restoring a deleted one, adding brokers, changing the instance type, and growing storage all check these limits. A company admin can request a higher limit in **Settings** > **Product limits**.


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