Data Mover Failover

1. Data Mover Failover Upon completion of this module, you should be able to: Data Mover Failover Test Data Mover Failover and Failback Data Mover Failover

2. Data Mover Failover Lesson 1: Data Mover Failover • During this lesson the following topics are covered: • The failover process and policies • Standby Data Movers • Planning and Configuring Data Mover failover Data Mover Failover

3. Failover Process • Primary Data Mover (DM) fails • Designated Standby Data Mover is activated as a spare • Requires identical network configuration Primary Data Mover Standby Data Mover Data Mover Failover

4. Data Mover failure detection • Failover occurs under any of these conditions • Data Mover panic: A hardware or software faults • Data Mover hang: A condition that leads to both internal down • Failover failure: Failure during a failover operation. • Spontaneous Data Mover reset • Failover does not occur under these conditions • Manually restarting a Data Mover • Removing a Data Mover its slot • Network Failure Data Mover Failover

5. Monitor “Go!” Standby Data Mover Standby Data Mover Primary Data Mover Primary Data Mover Primary Data Mover FAILED Control Station Control Station Control Station Monitor Restore How Data Mover Failover Works • Normal operations • Control Station constantly monitors all Data Movers (DM) • When Primary DM fails • Control Station instructs Standby to take over • Standby resumes entire identity and all production services • Original Primary goes into failed state • After problem is resolved • Administrator manually initiates restoration of original Primary Data Mover Failover

6. Standby Data Mover • Hot-spare for Primary Data Movers • Can act as a spare for up to 7 primaries (depending on model) • Recommended ratio is at least one Standby for three primaries • For the highest availability, use 1:1 ratio • On a two Data Mover VNX, server_3 is pre-configured as a Standby for server_2 • VNX OE software is the same for all hardware platforms Data Mover Failover

7. Failover Policies • Pre-determined action • Invoked by the Control Station when it detects a failover condition • Policy types • Auto • Retry • Manual Data Mover Failover

8. Planning for Data Mover Failover • Determine Primary and Standby Data Movers • Ensure Primaries and Standbys have the same network hardware components • Standbys are free of any configurations • Switch ports of the Standby Data Movers are assigned to the same VLANs as the Primary • Ethernet Jumbo frame configuration related to Primary Data Mover ports are in place for the Standby Data Mover • Network configuration must be identical • Speed/Duplex • LACP / Link aggregation • Fail Safe Networking (FSN) Data Mover Failover

9. Failover Configuration • To configure server_3 as the Standby for server_2: • Select System > Hardware > Data Movers • Select the Data Mover, and click Properties. • Set Standby Movers to server_3 • Failover Policy, auto • Click Apply Server role Standby DM Failover policy Data Mover Failover

10. Data Mover Failover Lesson 1: Summary During this lesson the following topics were covered: The failover process and policies Standby Data Movers Planning and Configuring Data Mover failover Data Mover Failover

11. Data Mover Failover Lesson 2: Testing Data Mover Failover and Failback During this lesson the following topics are covered: Testing Data Mover failover Restoring a Data Mover Deleting a Data Mover failover relationship Data Mover Failover

12. Data Mover Failover Testing Considerations • Test Data Mover failover periodically/regularly (e.g. Quarterly) • Perform test at low/no impact times • When testing, validate the following • Standby assumes the identity of Primary • VLAN membership and LACP configuration • User access to: • File systems • Shares • Home directories Data Mover Failover

13. Testing Data Mover Failover • Run the following CLI Command to manually activate the Standby Data Mover server_standby <primary_DM> –activate mover Data Mover Failover

14. Restoring a Data Mover After Failover System > Hardware > Data Movers • Select Data Mover to restore and click Restore Data Mover Failover

15. Deleting a Failover Relationship • To change Data Mover from Standby to Primary: Hardware →Data Movers →server_x→select Role: Primary • To delete Standby relationship: Hardware → Data Movers > Server_x→ uncheck field Standby Movers Data Mover Failover

16. Data Mover Failover Lesson 2: Summary During this lesson the following topics were covered: Testing Data Mover failover Restoring a Data Mover Deleting a Data Mover failover relationship Data Mover Failover

17. Summary Key points covered in this module: • Successful Data Mover failover requires careful planning of network switch and port configurations • Test plans should include validating access to VNX resources: • File systems • Shares • Home directories Data Mover Failover

18. Course Summary Key points covered in this course: • Configuration of Unisphere Security and Features • Configuration and management of VNX block access for open systems hosts (Linux, Windows and VMware ESXi) • Configuration and management of VNX file access for Windows and Linux user/application environments via NFS and CIFS environments • Configuration of VNX local replication in block and file environments Data Mover Failover