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Description of problem:

I hope RHELv6 support Block Migration for KVM?

Since qemu-kvm-0.12.2, it supports a function named "Block Migration". So we
can do live-migration without shared storage.

http://www.linux-kvm.com/content/qemu-kvm-0122-released

http://www.linux-kvm.com/content/qemu-kvm-012-adds-block-migration-feature

There's a new feature called block migration available with the recently released qemu-kvm-0.12 version. Patches for this feature was first introduced back in November 2009 by ibm and allows you to do block migration during live migration. It works by copying block images to a destination asynchronously. It does this by copying the whole disk first then copying dirty blocks accumulated during the migration similarly to ram migration.

This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated
in the current release, Red Hat is unfortunately unable to
address this request at this time. Red Hat invites you to
ask your support representative to propose this request, if
appropriate and relevant, in the next release of Red Hat
Enterprise Linux. If you would like it considered as an
exception in the current release, please ask your support
representative.

This request was erroneously denied for the current release of Red Hat
Enterprise Linux.  The error has been fixed and this request has been
re-proposed for the current release.

We already track this feature request (that is targeted at 6.2/6.3) by 582475

*** This bug has been marked as a duplicate of bug 582475 ***