If you are using array-based replication, it is best to refer to your array vendor's procedure for extending replicated LUNs. Some handle this in different ways than others. For example, an EMC VNX with MirrorView I used at a past job required me to break the replication, extend both sides, and re-enable (requiring a full resync). But with Compellent arrays at my current job, expanding the source volume also expands the mirrored volume automatically without having to do anything special.
↧