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I'm currently working on a project where Azure Site Recovery will be used as a DR solution for a fully virtualized datacenter based on Hyper-V and managed by SCVMM.

The datacenter contains several Linux VMs, and most of them have several virtual disks; those disks can be a mix of IDE and SCSI (depending on how and when the VMs were created), and most Linux systems use old-style mount tables, referring to disks as /dev/hdX or /dev/sdX, instead of using GUIDs or volume labels.

We are concerned about what will happen to those VMs when failing them over to Azure; they will get a new disk (the temporary one) which will for sure screw up device numbering, and I'm also wondering if some IDE-to-SCSI conversion will take place, further complicating things.

Also, this is a disaster recovery solution, not a permanent migration: thus it will also be necessary to fail back all those VMs, after a disaster (or a planned DR test) happened and was risolved.

This should be relatively easy to manage on Windows systems (see here), but what about Linux systems, and especially Linux systems which use old-style mount tables?

Will the Azure agent (to be installed in guest systems prior to failing them over) take care of this, or is additional work required?

  • How many machines you have to migrate? There's e2label command which you can use for giving those existing disks a label. Then just modify /etc/fstab accordingly and stop worrying. – Janne Pikkarainen Oct 25 '16 at 10:08
  • Tens, possibly hundreds, each one with its own peculiar disk setup; also, they are production machine, and we don't have direct root access to them (we have to go through several people and hops even to install agents and updates on hosts and VMs). – Massimo Oct 25 '16 at 10:52
  • Of course, we are considering labeling disks and modifying fstabs accordingly; but it would be a lot simpler if this wasn't necessary. – Massimo Oct 25 '16 at 10:53
  • Are all these Linux VMs running supported Operating Systems? – Bruno Faria Oct 26 '16 at 23:47

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