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Eorror occurs when use virt-v2v command on KVM host

in Oracle Linux Virtualization Manager (OLVM) (MOSC) 3 commentsAnswered ✓

Hello.

I'm trying to migration from OVS to KVM host using virt-v2v.

When I try to migrate windows machine, the following error occurs in Inspecting the overlay . 

"virt-v2v: error: filesystem was mounted read-only, even though we asked for it to be mounted read-write.  This usually means that the filesystem was
 not cleanly unmounted.  Possible causes include trying to convert a guest which is running, or using Windows Hibernation or Fast Restart."

I did not mount read-only and Windows VM is not configured fast restart.

How can I fix it?

Version info is below.

Oracle VM Server 3.4.4

OLVM 4.4

KVM host OL8.8

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