Link to data egress

geoschem · Mar 12, 2018 · afc74f3 · afc74f3
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diff --git a/doc/source/chapter02_beginner-tutorial/basic-aws-services.rst b/doc/source/chapter02_beginner-tutorial/basic-aws-services.rst
@@ -32,6 +32,8 @@ In this section you will familarize yourself with the following concepts and the
 
   S3 is thus the default storage mechanism for most of :ref:`Earth Science Big Data <earth-data-label>`. Later in this tutorial you will learn how to access all 30 TB of GEOS-Chem input data on S3, as well as other  `public Earth Science data on AWS <https://aws.amazon.com/earth/>`_. You will also upload your own data (e.g. model simulation results) to S3.
 
+.. _data-egress-label:
+
 - **Data egress charge** is an additional charge besides compute (EC2) and storage (EBS, S3). While **transfering data into the cloud is free**, almost all commercial cloud providers **charge for data transferring out of their cloud** -- that's how they make money and encourage people to keep stuff within their cloud. The data egress fee on AWS is $0.09/GB. AWS does also offer `Data egress discount to researchers <https://aws.amazon.com/blogs/publicsector/aws-offers-data-egress-discount-to-researchers/>`_, but the discount cannot exceed 15% of total AWS cost.
 
   The data egress fee is actually not a big worry because:

diff --git a/doc/source/chapter02_beginner-tutorial/use-s3.rst b/doc/source/chapter02_beginner-tutorial/use-s3.rst
@@ -170,6 +170,6 @@ Access GEOS-Chem input data repository in S3
                              PRE SPC_RESTARTS/
   2018-03-08 00:18:41       3908 README
   
-GEOS-Chem input data bucket uses `requester-pay mode <https://docs.aws.amazon.com/AmazonS3/latest/dev/RequesterPaysBuckets.html>`_. Transfering data from S3 to EC2 (in the same region) has no cost. But you do need to pay for the egress fee it you download data to local machines.
+GEOS-Chem input data bucket uses `requester-pay mode <https://docs.aws.amazon.com/AmazonS3/latest/dev/RequesterPaysBuckets.html>`_. Transfering data from S3 to EC2 (in the same region) has no cost. But you do need to pay for the :ref:`egress fee <data-egress-label>` it you download data to local machines.
 
 The tutorial AMI only has 1-month GEOS-FP metfield. You can get other metfields from that S3 bucket, to support simulations wtih any configurations.