docs-v2/content/shared/influxdb3-write-guides/use-telegraf/dual-write.md

Use Telegraf to write your data simultaneously to multiple InfluxDB instances or clusters. This method, known as "dual writing," is useful for backing up data to a separate instance or for migrating from other versions of InfluxDB to {{< product-name >}}.

The following example configures Telegraf for dual writing to {{% product-name %}} and an InfluxDB v2 OSS instance.

• The InfluxDB v2 output plugin twice--the first pointing to {{< product-name >}} and the other to an InfluxDB v2 OSS instance.

• Two different tokens--one for InfluxDB v2 OSS and one for Clustered. Configure both tokens as environment variables and use string interpolation in your Telegraf configuration file to reference each environment variable.

  [!Note] While in alpha, {{< product-name >}} does not require an authorization token. For the token option, provide an arbitrary, non-empty token string.

Sample configuration

# Include any other input, processor, or aggregator plugins that you want to
# include in your configuration.

# Send data to {{% product-name %}}
[[outputs.influxdb_v2]]
  ## The {{% product-name %}} URL
  urls = ["http://{{< influxdb/host >}}"]
  ## {{% product-name %}} authorization token
  token = "${INFLUX_TOKEN}"
  ## For {{% product-name %}}, set organization to an empty string
  organization = ""
  ## Destination database to write into
  bucket = "DATABASE_NAME"

# Send data to InfluxDB v2 OSS
[[outputs.influxdb_v2]]
  ## The InfluxDB v2 OSS URL
  urls = ["http://localhost:8086"]
  ## OSS token for authentication
  token = "${INFLUX_TOKEN_OSS}"
  ## Organization is the name of the organization you want to write to.
  organization = "ORG_NAME_OSS"
  ## Destination bucket to write to
  bucket = "BUCKET_NAME_OSS"

Telegraf lets you dual write data to any version of InfluxDB using the influxdb (InfluxDB v1) and influxdb_v2 output plugins. A single Telegraf agent sends identical data sets to all target outputs. You cannot filter data based on the output.

[!Note] InfluxDB v1 does not support the unsigned integer data type. You can only write unsigned integer field values to InfluxDB v2- and 3-based products.