Thanks. I guess the big question is what impact such GUID change will have on the applications.

I accepted your answer (thanks). BTW, is it possible to accept only one answer? I wanted to accept some others as well but the check mark is grayed out. Also, I don't see response from Alexey any more in this thread. Is it possible a response can be removed?

Ok. I am going to leave it unchanged then.

But just out of curiosity, is it even possible to change the GUID of an instance? 

Thanks,

Raghu

Thanks for quick response.

I don't mind leaving the GUID untouched but then the question is, would it be alright for two instances (on different hosts) to have same GUID?

Do note that the restored instance is meant for test purposes and would usually be removed after the testing. 

Thanks,

Raghu

Thanks for the pointer. I couldn't figure out exact code to set "AuthEnabled" property so instead, I used "Import" function to modify it. I found the exact value for "OS Authentication" by exporting from another instance where I enabled it from UI.

Thanks,

Raghu

I think my following post in this forum may help in understanding the use case.

    https://community.intersystems.com/post/does-externalfreeze-command-upda...

In short, the use case is to bring up a Cache instance on a test machine from a production backup. As I explained in the above post, I will bring back all the file systems at same mount points. Are you saying that I can just start Cache in normal mode because recovery happens automatically? The answer in the above post mentions that it is better to do journal recovery.