Hello John,  Please keep in mind that Veritas base on disk blocks not cylinder, so this Software itself is not affected by replication until the layer below (disk geometry) is not changed. I never replicated any windows data, but I did it a hundred times with unix* from DMX2 to DMX3/4 and back. The only one problem is with Solaris but I clarified it. Veritas uses group of disk (vxdg list), to check exact list of used (and available) disks issue vxdisk -o alldgs list. volume in veritas is located on plex, and plex on subdisk (continues disk space), to see whole structur issue vxprint -ht.  As I said, if windows uses LBA to address blocks on disks (I am 99% sure of that) there should not be a problem with data replication. Please keep in mind that target device must be the same size (or greater) and the same configuration (if you use meta, target must be meta device of the same number of hypers). I would not recommend to replicate to a greater device because you may not perform failback !!.  LBA should not be mapped on public area. If you have an empty disk (lun) you must first setup it under  veritas to be able to add it to a group or create a new one (vxdisksetup -i ). During that operation veritas creates private and public region.  Best regards, Tomek
Hi, I have a significant SRDF migration proposed that is copying between DMX3000 and DMX-4. So, fully understand the cylinder size etc. is doubled with the target disk geometry. However, as per Primus 164225/127138, I understand Veritas Volume Manager may have issues with the target private region increasing, but this is not expanded on other than Private region increases/public region decreases.  I am trying to understand the full detail of how Veritas might cope with this, what problems might manifest, both at point of migration and whether there is a data risk in the future when Veritas performs some Private region task. Can anybody fully explain how Veritas will or will not cope with this SRDF migration? Forums are chokka with advice about Solaris issues, but I have found nothing about VeritasVM on W2K3....   Thanks .. John.
SRDF migration, DMX-2 to DMX-3, effect on Veritas VM (windows version)