_discoverable: yes
---
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title: ungleich infrastructure availability
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subtitle: Making your services dependable
---
description1:

## Infrastructure availability

This is version **1.0 of the ungleich infrastructure availability definition**.

Depending on your project or business case you have different
availbility requirements. At ungleich we accomodate the range
from "can be offline for a while" up to "is mission critical".
We orientate ourselves on the It standard availability definitions
"availability per year". The following table gives an overview of
typical availability rates:


```
| %      | Accepted downtime / year |
|--------+--------------------------|
| 98     | 175.2h or 7.3 days       |
| 99     | 87.6h or 3.65 days       |
| 99.9   | 8.76h                    |
| 99.99  | 0.876h or 52.55 minutes  |
| 99.999 | 5.25 minutes             |
```

## General availability

If not otherwise specified, the **target availability** for every
service is 99.9%. This availability is **not guaranteed by
default**. However we offer **guaranteed availability** for a range of
our products.

## Guaranteed availability

We can guarantee availability of individual services depending on your
needs. As every customer need and product is individual, you can
[ask for an individual offer](/u/contact/) for your services.

## High Availability Methods

To improve the default availability, we offer a variety of
add-ons. Depending on the booked service, different methods are
applicable. In this section we describe the general methods we offer.

### Redundant storage

By default all data is replicated 3 times accross our decentralised
storage system. This protects against disk failures like a traditional
RAID system does. Note that this does not protect against
unintentional deletion, for this you require a backup.

### Offsite backup

To allow disaster recovery, we offer [offsite backups](../backup/)
for most of our services. The data is stored in a physical different
location so that even physical damage to a data center will allow you
to restore your data.

### Dedicated Internet uplinks and IP blocks

To protect you against DDoS and impacts on our general infrastructure,
we offer dedicated Internet uplinks that are reserved for your
service. This includes a /48 IPv6 address block by default for BGP
announcement. A /24 IPv4 address block for indidivual BGP announcement
can be added at an extra service cost.

### Redundant services / High availability (HA)

We realise high availability (HA) using redundant services. These
services can be placed in the same geographic or different geographic
data centers. Depending on the service architecture we offer
Cold-Standby, Hot-Standby or active-active services.

With different geographic locations separate data storage is included
by default. For services in the same location, an optional separate
data storage is also available.

### Load Balancing

For services that allow multiple backends, we offer load balancing
services to distribute the traffic. This can be combined with
dedicated uplinks per location, indivual IP address blocks and
distributed application deployments in multiple locations. You can
also easily realise [blue green
deployments](https://en.wikipedia.org/wiki/Blue-green_deployment) or
[Canary releases](https://martinfowler.com/bliki/CanaryRelease.html).

## Related pages

* [ungleich SLAs](../ungleich-sla/)
* [ungleich Service Hours](../ungleich-service-hour/)
* [ungleich Support Packages](../ungleich-support-package/)