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Dell DL1000 Appliance User's Guide

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Launching a bare metal restore for a Linux machine

Your DL1000 can perform a Bare Metal Restore (BMR) for a Linux machine including rollback of the system volume. Using the AppAssure command line utility aamount, roll back to the boot volume base image. Before you can perform a BMR for a Linux machine, you first must do the following:
  • Obtain a BMR Live CD file from AppAssure support, which includes a bootable version of Linux.
    • NOTE: You can also download the Linux Live CD file from the license portal at https://licenseportal.com.
  • Ensure that there is enough space on the hard drive to create destination partitions on the target machine to contain the source volumes. Any destination partition should be at least as large as the original source partition.
  • Identify the path for the rollback, which is the path for the device file descriptor. To identify the path for the device file descriptor, use the fdisk command from a terminal window.
    • NOTE: Before you begin utilizing the AppAssure commands, you can install the screen utility. The screen utility enables you to scroll the screen to view larger amounts of data, such as a list of recovery points.
To perform a bare metal restore for a Linux machine:
  1. Using the Live CD file you receive from AppAssure, boot up the Linux machine and open a Terminal window.
  2. If needed, create a new disk partition, for example, by running the fdisk command as root, and make this partition bootable by using the a command.
  3. Run the AppAssure aamount utility as root, for example: sudo aamount
  4. At the AppAssure mount prompt, enter the following command to list the protected machines: lm
  5. When prompted, enter the IP address or host name of your AppAssure Core server.
  6. Enter the logon credentials, that is, the username and password, for this server. A list is displayed showing the machines protected by this AppAssure Core server. It lists the machines found by line item number, host/IP address, and an ID number for the machine (for example: 293cc667-44b4-48ab-91d8-44bc74252a4f).
  7. To list the currently mounted recovery points for the machine that you want to restore, enter the following command: lr <machine_line_item_number>
    • NOTE: You can also enter the machine ID number in this command instead of the line item number.
    A list is displayed that shows the base and incremental recovery points for that machine. This list includes a line item number, date/timestamp, location of volume, size of recovery point, and an ID number for the volume that includes a sequence number at the end (for example: ” 293cc667-44b4-48ab-91d8-44bc74252a4f:2”), which identifies the recovery point.
  8. To select the base image recovery point for rollback, enter the following command: r <volume_base_image_recovery_point_ID_number> <path>
    • CAUTION: You must ensure that the system volume is not mounted.
    This command rolls back the volume image specified by the ID from the Core to the specified path. The path for the rollback is the path for the device file descriptor and is not the directory to which it is mounted.
    • NOTE: You can also specify a line number in the command instead of the recovery point ID number to identify the recovery point. Use the agent/machine line number (from the lm output), followed by the recovery point line number and volume letter, followed by the path, such as, r <machine_line_item_number> <base_image_recovery_point_line_number> <volume_letter> <path> . In this command, <path> is the file descriptor for the actual volume.
  9. When prompted to proceed, enter y for Yes. After the rollback proceeds, a series of messages appear that notify you of the status.
  10. Upon a successful rollback, if needed, update the main boot record with the restored bootloader.
    • NOTE: Repairing or setting up the bootloader is only needed if this disk is new. If this is a simple rollback to the same disk, setting up the bootloader is not necessary.
    • CAUTION: Do not unmount a protected Linux volume manually. In the event that you need to manually unmount a protect Linux volume, you must execute the following command before unmounting the volume: bsctl -d <path to volume>

      In this command, <path to volume> does not refer to the mount point of the volume but instead refers to the file descriptor of the volume; it must be in a form similar to this example: /dev/sda1.

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