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4.2. Live Migration and Red Hat Enterprise Linux Version Compatibility
Live Migration is supported as shown in table Table 4.1, “Live Migration Compatibility”:
Table 4.1. Live Migration Compatibility
|Migration Method||Release Type||Example||Live Migration Support||Notes|
|Forward||Major release||5.x → 6.y||Not supported|
|Forward||Minor release||5.x → 5.y (y>x, x>=4)||Fully supported||Any issues should be reported|
|Forward||Minor release||6.x → 6.y (y>x, x>=0)||Fully supported||Any issues should be reported|
|Backward||Major release||6.x → 5.y||Not supported|
|Backward||Minor release||5.x → 5.y (x>y,y>=4)||Supported||Refer to Troubleshooting problems with migration for known issues|
|Backward||Minor release||6.x → 6.y (x>y, y>=0)||Supported||Refer to Troubleshooting problems with migration for known issues|
Troubleshooting problems with migration
- Issues with SPICE — It has been found that SPICE has an incompatible change when migrating from Red Hat Enterprise Linux 6.0 → 6.1. In such cases, the client may disconnect and then reconnect, causing a temporary loss of audio and video. This is only temporary and all services will resume.
- Issues with USB — Red Hat Enterprise Linux 6.2 added USB functionality which included migration support, but not without certain caveats which reset USB devices and caused any application running over the device to abort. This problem was fixed in Red Hat Enterprise Linux 6.4, and should not occur in future versions. To prevent this from happening in a version prior to 6.4, abstain from migrating while USB devices are in use.
- Issues with the migration protocol — If backward migration ends with "unknown section error", repeating the migration process can repair the issue as it may be a transient error. If not, please report the problem.
Configuring Network Storage
Configure shared storage and install a guest virtual machine on the shared storage.
Alternatively, use the NFS example in Section 4.3, “Shared Storage Example: NFS for a Simple Migration”