Question

How can I mount a virtual server's disk to a server directly? I need to recover files or perform other tasks.


Environment

OnApp 2.x and up

Virtual Servers running on KVM and XEN compute resources using LVM or Integrated storage

Answer

To mount a virtual server's disk:

  1. Get the identifier for the VS disk.

  2. Identify the type of storage: Integrated storage or LVM (if SolidFire is used, contact their support). 

    Identifiers starting with onapp- tend to be an LVM data store.

  3. Activate the disk on the server where you want to mount the disk.

           • For LVM, run the following command:

lvchange -a y /dev/onapp-xxxxxx/yyyyy 
CODE

          Where:

          onapp-xxxx - the datastore identifier
          yyyy - the disk identifier 

    The device /dev/onapp-xxxxxx/yyyyy is your VS disk now.

          • For Integrated Storage, run the following command:

onappstore getid
onappstore online uuid=<yyyyyyy> frontend_uuid=<server's uuid from previous command>
CODE

 The device /dev/xxxxxxxx/yyyyyy is your VS disk now.

      Where:

      xxxxx - the data store identifier

      • For KVM compute resources, map partitions before mounting:

kpartx -a -v -p X <disk device>
CODE

       4. Mount the resulting /dev/mapper/......X1 device.
       5. To undo these steps, you need to umount the disk and then unmap partitions, if needed:

kpartx -d -v -p X <disk device>
CODE

        6. Deactivate the disk:
          • LVM:

lvchange -a n /dev/onapp-xxxxxx/yyyyyy
CODE

         • Integrated Storage:

onappstore offline uuid=yyyyyy 
CODE