1) you can find con.pool configuration related to this ms-sql datasource in application server's domain.xml
AS_INSTAL_DIR/domains/<domain-name>/config/domain.xml.
eg:
<jdbc-connection-pool ...
</jdbc-connection-pool>
2) Does your persistence.xml (EJB) have
<jta-data-source> or <non-jta-data-source> specified?
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