Introduction to high availability  and disaster recovery 1 This chapter describes high availability (HA) and disaster recovery (DR), including  technologies that are used with clusters to restart the servers. In addition, this chapter  introduces the IBM VM Recovery Manager for HA and DR. The following topics are described in this chapter: GLYPH<SM590000> General high availability and disaster recovery overview GLYPH<SM590000> Restart technologies and clustering methods GLYPH<SM590000> VM Recovery Manager HA GLYPH<SM590000> IBM VM Recovery Manager DR ' Copyright IBM Corp. 2 019. All rights reserved. 1