rhtyd commented on issue #3290: KVM: if a volume is detached before OS has boot 
and migrated, admin not able to attach back 
URL: https://github.com/apache/cloudstack/issues/3290#issuecomment-486119483
 
 
   The limitation is known for years, this was the previous issue ticket 
discussing the limitation: https://issues.apache.org/jira/browse/CLOUDSTACK-2725
   
   It still seems to happen even when KVM host has hotplugging capabilities: 
   ```
   # grep "CONFIG_HOTPLUG_PCI_ACPI=" /boot/config-`uname -r`
   CONFIG_HOTPLUG_PCI_ACPI=y
   # grep "CONFIG_HOTPLUG_PCI=" /boot/config-`uname -r`
   CONFIG_HOTPLUG_PCI=y
   # grep "CONFIG_MEMORY_HOTPLUG=" /boot/config-`uname -r`
   CONFIG_MEMORY_HOTPLUG=y
   ```

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