Dell EMC PowerProtect DDVE on Google Cloud Platform 7.9 Installation and Administration Guide

System Headswap for DDVE block storage in GCP

A system headswap recovers a DDVE instance from a head unit failure. The head unit refers to the DDVE root disk.

1. Create instance B with the same instance type and DDOS build. Do not create an NVRAM disk for the new instance.
2. Detach the NVRAM and data disks from the failed head unit (instance A).
   
3. If instance B was deployed with an NVRAM disk, detach the NVRAM disk, then attach the NVRAM and data disks from instance A to instance B with the same order. Save the configuration of instance B.
   
4. Run the system headswap command on instance B.
   NOTE The system restarts during the headswap process.

   # system headswap
   
   This command returns the system back to its prior operational
   conditions. The system will be rebooted before
   resuming normal operations.
   
   **   If system passphrase was set on the old head, you will
        need to do one of the following after headswap completes:
        - unlock the filesystem          if you have encrypted data, or
        - set the system passphrase      if you don't have encrypted data
   
           Are you sure? (yes|no) [no]: yes
   
   ok, proceeding.
   
   Please enter sysadmin password to confirm 'system headswap':
   Restoring the system configuration, do not power off / interrupt process ...
   
   #
   Broadcast message from root (Fri May 25 07:12:35 2018):
   The system is going down for reboot NOW!
   

5. Verify the file system status after the headswap process completes.

   # filesys status
   The filesystem is enabled and running.