Heavy reads to the OperationsManagerDW database - is this normal?

We have a SCOM deployment with two management servers. We placed the standard operations manager database on an instance in a SQL server cluster. We placed the data warehouse database on the same SQL cluster, but in a different instance.
We monitor about 50 servers, with the load being split equally between our two management servers. Performance in the UI seems fine, although we really haven't spent much time customizing or doing any reporting at all.
My problem is that the data warehouse database has massive (for our environment compared to everything else) reads - about 250Mb/s constantly. It will peak to 400mb/s.
Is this normal? What can I do to tell what it is that is actually hitting the database?
Thanks!

Looks like I figured it out.
This article is what I used to resolve it: http://deploymentportal.blogspot.com/2012/08/operations-manager-data-warehouse.html
Turns out I had over 7 million rows in the AlertStage table (determined by: select count(*) from Alert.AlertStage)
I ran this, and it cleared all of them out:
SELECT count(*) from ALert.AlertStage
SELECT * INTO ALert.AlertStage_backup FROM ALert.AlertStage
SELECT count(*) from ALert.AlertStage_backup
TRUNCATE TABLE ALert.AlertStage
SELECT count(*) from ALert.AlertStage
My reads have gone from about 300MB/s to 68Kb/s.

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Heavy reads to the OperationsManagerDW database - is this normal?

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