What causes a device group to become invalid?

Question

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 questions: What causes a DG to become invalid? How can I repair these 2 invalid groups? How can I get information about which devices are actually in these groups, because a symdg show doesn't show that                         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?

Sam Claret · Accepted Answer

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

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RRR · Answer

Thanks, Sam! It helped!!! You're the best

Sam Claret · Answer

Almost anytime ☺ Sam Claret Technical Support Engineer III Worldwide Technical Support – OSAPI Windows Office Hours: Rotating shift, 7AM – 4PM GMT Office #: +353 21 494 5981

RRR · Answer

Ah, didn't see you answered the question already while I was writing my 2nd post. I'm doing an export now. Thanks!

RRR · Answer

When I do a 'symdev show' of ALL devices on that particular Symm from the host with these 2 invalid DGs I found out which 14 devices I was missing, but that script took all night to run . There must be an easier and faster way, or is there?

Symmetrix

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