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_discoverable: yes
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---
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_hidden: no
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---
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title: ungleich infrastructure availability
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---
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subtitle: Making your services dependable
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---
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description1:
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## Infrastructure availability
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2021-09-20 02:50:50 +00:00
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This is version **1.0 of the ungleich infrastructure availability definition**.
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Depending on your project or business case you have different
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availbility requirements. At ungleich we accomodate the range
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from "can be offline for a while" up to "is mission critical".
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We orientate ourselves on the It standard availability definitions
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"availability per year". The following table gives an overview of
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typical availability rates:
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```
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| % | Accepted downtime / year |
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|--------+--------------------------|
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| 98 | 175.2h or 7.3 days |
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| 99 | 87.6h or 3.65 days |
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| 99.9 | 8.76h |
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| 99.99 | 0.876h or 52.55 minutes |
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| 99.999 | 5.25 minutes |
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```
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## General availability
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If not otherwise specified, the **target availability** for every
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service is 99.9%. This availability is **not guaranteed by
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default**. However we offer **guaranteed availability** for a range of
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our products.
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## Guaranteed availability
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We can guarantee availability of individual services depending on your
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needs. As every customer need and product is individual, you can
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[ask for an individual offer](/u/contact/) for your services.
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## High Availability Methods
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To improve the default availability, we offer a variety of
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add-ons. Depending on the booked service, different methods are
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applicable. In this section we describe the general methods we offer.
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### Redundant storage
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By default all data is replicated 3 times accross our decentralised
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storage system. This protects against disk failures like a traditional
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RAID system does. Note that this does not protect against
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unintentional deletion, for this you require a backup.
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### Offsite backup
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To allow disaster recovery, we offer [offsite backups](../backup/)
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for most of our services. The data is stored in a physical different
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location so that even physical damage to a data center will allow you
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to restore your data.
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### Dedicated Internet uplinks and IP blocks
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To protect you against DDoS and impacts on our general infrastructure,
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we offer dedicated Internet uplinks that are reserved for your
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service. This includes a /48 IPv6 address block by default for BGP
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announcement. A /24 IPv4 address block for indidivual BGP announcement
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can be added at an extra service cost.
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### Redundant services / High availability (HA)
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We realise high availability (HA) using redundant services. These
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services can be placed in the same geographic or different geographic
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data centers. Depending on the service architecture we offer
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Cold-Standby, Hot-Standby or active-active services.
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With different geographic locations separate data storage is included
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by default. For services in the same location, an optional separate
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data storage is also available.
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### Load Balancing
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For services that allow multiple backends, we offer load balancing
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services to distribute the traffic. This can be combined with
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dedicated uplinks per location, indivual IP address blocks and
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distributed application deployments in multiple locations. You can
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also easily realise [blue green
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deployments](https://en.wikipedia.org/wiki/Blue-green_deployment) or
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[Canary releases](https://martinfowler.com/bliki/CanaryRelease.html).
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## Related pages
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* [ungleich SLAs](../ungleich-sla/)
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* [ungleich Service Hours](../ungleich-service-hour/)
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* [ungleich Support Packages](../ungleich-support-package/)
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