PowerProtect: PPDM Virtual Machine (VM): Unable to do File Level Restore for Linux VMs that have unformatted disks with a partition label.

摘要: This article provides a solution to a failed File Level Restore restore for VMs. These VMs have a disk with a partition label, but no partition assigned to it.

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症狀

VM file level restore fails to mount with error "VM Direct engine is unable to restore the virtual machine <vm-name> on vCenter <vCenter-name>.

When you check the Details of the failed job in the Errors tab, we see the below detailed error message. 
Unable to mount disks.  Unable to discover loop devices for disk 'vm-<moref>-disk-key-2001-flat.vmdk'.  Cannot determine partitions for '/dev/loop0'

Symptoms found in the logs: VM File level restore mount logs found in /logs/vproxyd/recycle/vproxyd/<timestamp> shows similar errors as below. 
2023-01-16T18:27:40.990Z TRACE:  [bc7b7a40fee3419b;a2f84f6f00805f44] ====Executing [/sbin/blkid -c /dev/null /dev/loop0]
2023-01-16T18:27:41.021Z TRACE:  [bc7b7a40fee3419b;a2f84f6f00805f44] /dev/loop0: PTUUID="0005ce97" PTTYPE="dos"
2023-01-16T18:27:41.021Z TRACE:  [bc7b7a40fee3419b;a2f84f6f00805f44] ====End of output from '/sbin/blkid'.
2023-01-16T18:27:41.021Z TRACE:  [bc7b7a40fee3419b;a2f84f6f00805f44] '/dev/loop0' has a partition table; looking for partitions.
2023-01-16T18:27:41.021Z ERROR:  [bc7b7a40fee3419b;a2f84f6f00805f44] Cannot determine partitions for '/dev/loop0'.
2023-01-16T18:27:41.021Z ERROR:  [bc7b7a40fee3419b;a2f84f6f00805f44] Unable to discover loop devices for disk 'vm-<moref>-disk-key-2001-flat.vmdk'.
2023-01-16T18:27:41.021Z TRACE:  [bc7b7a40fee3419b;a2f84f6f00805f44] ====Executing [/sbin/losetup -d /dev/loop0]
2023-01-16T18:27:41.237Z INFO:   [bc7b7a40fee3419b;a2f84f6f00805f44] Step 'Hot adding disks' done: Failed
2023-01-16T18:27:41.238Z INFO:   [bc7b7a40fee3419b;a2f84f6f00805f44] Unmounting after mount unsuccessful: Unable to discover loop devices for disk 'vm-175233-disk-key-2001-flat.vmdk'.  Cannot determine partitions for '/dev/loop0'..
2023-01-16T18:27:41.239Z TRACE:  [bc7b7a40fee3419b;a2f84f6f00805f44] Entering doUnmount.


原因

PowerProtect Data Manager is unable to mount the disks from the backup copy onto the target VM.  
This is primarily due to the backup copy containing an unformatted disk with a partition label but has no partition.

解析度

Perform Instant Access restore of the target VM and copy the necessary files or folders from the instant access VM.
To allow future file-level restores of the same VM, either;
  • Remove the partition label from the unformatted disk.
  • Remove the unformatted disk itself. 
Alternatively, upgrade PPDM and all the protection engines to version 19.13.
文章屬性
文章編號: 000210722
文章類型: Solution
上次修改時間: 24 5月 2023
版本:  2
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