Dell EMC PowerProtect DDVE in VMware Cloud 7.8 Installation and Administration Guide

Recovering DDVE with system headswap

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

1. Create instance B with head unit (root disk only) with the same instance type as system A.
2. Detach the vNVRAM and metadata storage from the broken head unit. On the Edit Settings page of the broken head unit, remove the vNVRAM and metadata storage.
   NOTE Do not select the checkbox Delete files from datastore.
   
3. Attach the vNVRAM and metadata storage to instance B head unit.
   1. On the Edit Settings page of instance B head unit, select ADD NEW DEVICE > Existing Hard Disk.
      
   2. Select files from the broken head unit and add to instance B head unit one by one.
      NOTE Ensure that the vNVRAM disk is attached before attaching the metadata disks.
      
4. Set the system B passphrase to match the system A passphrase.
   If the passphrases do not match, the headswap fails.

   # system passphrase set
   Enter new passphrase:
   Re-enter new passphrase:
   Passphrases matched.
   The passphrase is set.
   

5. Ensure that system A is powered off.
   This step is required to detach the bucket from system A and make it available to be attached with system B.
6. Run system headswap.
   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 (Mon Apr 30 13:44:10 2018):
    
   The system is going down for reboot NOW!
   

7. Ensure that the system is running after the headswap process is complete.

   # filesys status
   The filesystem is enabled and running.