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Dell EMC PowerProtect DDVE in the Azure Cloud 7.8 Installation and Administration Guide

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Recovering the DDVE instance

The system recovery procedure recovers a DDVE instance from failure of the head unit, NVRAM disk, metadata disks, or any combination of these components. The head unit is the DDVE root disk.

Prerequisites

System recovery between the same DDOS versions is recommended. When the same DDOS version is not available, system recovery can be done with a later DDOS version. The DDOS version compatibility rules are the same as the RPM upgrade.

A static IP address that is configured using DDVE interfaces (CLI or UI) is not recommended. If a static IP address is configured on the network interface in the original DDVE, the same configuration is restored on the new head. This scenario might cause a network disconnection.

Generally, instead of configuring a static IP address using DDVE interfaces, configure it in the cloud provider environment. The DDVE uses DHCP to obtain the static IP address that you configure in the cloud environment.

If you are already using a static IP address that is configured within DDVE, and a disconnection occurs after following these steps, power off the DDVE. Then add an additional network interface to the new DDVE, and login using the IP address of this interface. Finally, enable or reconfigure the primary network interface on the new head, preferably using DHCP.

About this task

Follow these steps only to recover DDVE when metadata disks or NVRAM disks are unavailable or failed. If both NVRAM and metadata disks are available, use Recovering DDVE with system headswap.

Steps

  1. Create instance B with the same configuration as instance A. It must include the same memory size, maximum capacity, and metadata disk capacity. The instance type can be a new generation type that the DDOS version supports.
  2. Enable the object-store: 
    # storage object-store enable
  3. Set the object-store profile:
    • Set the passphrase to match that of system A, otherwise, the recovery fails.
    • Set the storage account/container name to the same as system A.
    • When creating the profile on system B, select the same authentication method (OAuth 2.0 or HMAC) and the same access key (HMAC) as system A.
    Follow the CLI prompts: 
    # storage object-store profile set
A passphrase needs to be set on the system.
Enter new passphrase: <enter-passphrase-string-meeting-requirements>
Re-enter new passphrase: <re-enter-passphrase-string>
Passphrases matched.
The passphrase is set
        Enter the account name: <name-of-the-storage-account>
        Enter the primary key:
        Enter the container name: <name-of-the-container-name>

        Object-store endpoint needs the Baltimore CyberTrust Root certificate to be imported.
        Do you want to import that certificate with below fingerprint?
        D4:DE:20:D0:5E:66:FC:53:FE:1A:50:88:2C:78:DB:28:52:CA:E4:74  (yes|no) [yes]:

        Profile is set.
  4. Add a metadata disk:
    NOTE Add a data disk with the capacity to match or exceed the capacity of system A . 
    # storage add dev4
  5. Run the system recovery precheck: 
    # system recovery precheck from object-store
  6. Run the recovery: 
    # system recovery start from object-store
  7. Check the recovery status: 
    # system recovery status
    NOTE The system restarts during the recovery process.
  8. After the recovery process completes, check the file system status: 
    # filesys status

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