1) What causes a device group to become invalid – This is most often seen with SRDF where another host has manipulated the devices in the device group so that one or more devices have a different personality or sync state to that expected. If a symcfg discover does not rectify it you can do a symdg export of the device group. …..  2) Generally after doing the symdg export you look at the devices listed in the export file and determine how the devices are contrary to the device group – like a R1 device in an RDF2 device group  3) Symdg export – then symdev show……  Sam Claret Technical Support Engineer III  Worldwide Technical Support – OSAPI Windows Office Hours: Rotating shift, 7AM – 4PM GMT Office #: +353 21 494 5981
I encountered 2 invalid device groups on a host I'm using to control several groups. These 2 groups contain 14 and 10 devices, but I can't see which devices are in these groups.   I have 3                            D E V I C E      G R O U P S Name               Type     Valid  Symmetrix ID  Devs group1             REGULAR  No     001234567890    14 group2             REGULAR  No     001234567890    10  The thing is that the documentation doesn't show what's supposed to be in these groups. Is there another way to know which devices are in these groups?
What causes a device group to become invalid?