On Mon, Jan 22, 2018 at 7:21 AM, Zip <plord@intricatenetworks.com> wrote:
I am having an issue where when I use the REST API to connect a snapshot from another VM to a Backup-Appliance-VM, after the clone when I remove the Disk and delete the Snapshot, the disk remains in the Backup-Appliance-VM as /dev/sdb ot /dev/vdb. 

If I reboot the Bakup-Applicance-VM the disk disappears.

If I manually remove the disk by "echo 1 > /sys/block/sdb/device/delete” the disk will disappear, but if I rescan the scsi bus, it is found and shows up again in the VM OS, but the oVirt WebGUI does NOT show it as connected.

The first part is expected - the 2nd isn't.
 

I am also not able to attach any other disks as it complains of :

HotPlugDiskVDS failed: internal error: unable to execute QEMU command '__com.redhat_drive_add': Duplicate ID 'drive-scsi0-0-0-2' for drive

I did see that others in the past have gotten around this issue by rebooting the Backup-Appliance-VM and then continuing on with the next VM backup and looping through backup-reboot-backup-reboot-etc. 

Anyone have an idea on how to solve this issue and remove the hooks from the guest OS?

Steps to reproduce this issue:

  1. Create a backup appliance VM to be used for the backup script execution
  2. Currently I have the Vms set to virtio with threaded I/O enabled. Also tried virtio_scsi with same result.
  3. Using REST API – make snapshot of target VM
  4. Using REST API – fetch vm metadata
  5. Using REST API – attach the snapshot/disk to the Backup-Appliance-VM
  6. dd the drive to backup folder
  7. Using REST API – remove the disk from the Backup-Appliance-VM
  8. Using REST API – delete the snapshot
  9. ** Check the guest OS of the Backup-Appliance-VM and the mounted drive from the backup above still appears and behaves as mentioned in comments above.


There are many details missing, including versions of everything used, but logs would be most helpful here.
 
A second issue is that the above wont work when I have the Vms running on MPIO iSCSI storage, so for testing I have moved to NFS4. Anyone have ideas about either issue, I’d love to hear ;)

Same - logs would be helpful here.
Y.
 

Thanks

zipur



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