From cd1c7a6a74a48f6b4963a141143db9fa1558b53e Mon Sep 17 00:00:00 2001 From: Nico Schottelius Date: Sun, 19 Sep 2021 14:21:03 +0900 Subject: [PATCH] ++ availability notes --- .../contents.lr | 60 +++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/content/u/products/ungleich-infrastructure-availability/contents.lr b/content/u/products/ungleich-infrastructure-availability/contents.lr index c8ed492..270ae7e 100644 --- a/content/u/products/ungleich-infrastructure-availability/contents.lr +++ b/content/u/products/ungleich-infrastructure-availability/contents.lr @@ -15,8 +15,68 @@ availbility requirements. In the IT industry, we usually use the concept of accepted percentage downtime per year. The follow table lists the typical availability categories: +``` | % | Accepted downtime / year | | 99 | 87h 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 at minimum 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 and indivual IP address blocks.