Add release notes for new feature, Cluster Mirrors (aka CLVM Mirrors), with Red Hat Cluster Suite for RHEL 4.5. Content supplied by Rob Kenna or Ben Kahn?
making this bug block tracker bug (BZ#239985)
Synchronous Mirroring is now available as an addition to the Cluster Logical Volume Manager (CLVM). This provides for two leg mirrors with a single transaction log which tracks blocks as they are duplicated. This is synchronous in that the write is not complete until both legs have been updated. If one side of the mirror is lost, operation will continue on the remaining side. For this first version, even a temporary loss of one side will necessitate a full recovery. This recovery will occur in the back ground. More than 2 legs can be configured, but the loss of any leg will require dropping down to 1 side and the recreation of all others.
revised for consistency and style: <quote> Synchronous Mirroring has been added to the Cluster Logical Volume Manager (CLVM). This allows two leg mirrors to use a single transaction log, which track blocks as they are duplicated. The write will not complete until both legs have been updated. If one leg of the mirror is lost, the operation will continue on the remaining leg. Note that even a temporary loss of one leg will necessitate a full recovery. This recovery will occur in the background. More than two legs can be configured. However, the loss of any leg will require dropping down to one leg and recreating all others. </quote> added to Cluster Suite 4.5 release notes; please advise if any revisions are necessary.