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, thanks.

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. Will give it a try.

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

Excellent. Thanks.

Thanks. Will take a look.

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.

Great. Thanks.

Ray,

Thanks for detailed answer. I do wish to use Freeze command for the backup so I will perform the journal restore. Based on your explanation then, is it sufficient to do this restore using just the journal file that is switched to at the time of Freeze? 

Thanks,

Raghu

Excellent. Thanks a lot. This is extremely useful.

Raghu.

Nice. Thanks for quick response.

Once I created the directory "/usr/local/etc/cachesys", "ccontrol create" worked. Thanks a lot.

Hi,

"ccontrol create" works well if I do this operation on a machine that already has some other cache instance installed. But when I do similar sequence of operations on a machine that has no previous Cache installation, "ccontrol create" fails with the error message:

"ccontrol(create registry): No such file or directory"

Apparently, it is trying to access the file "/usr/local/etc/cachesys/cache.reg" which is obviously not there. Is there any way to create Cache registry on the fly?

Thanks in advance,

Raghu

Thanks. I will give it a try.

Excellent. Thanks to everyone who chimed in.  Much appreciated.

Raghu.

Thanks for quick response.

Now, I am trying to run the following code on a Linux box as follows (CACHE is the instance name):

"csession CACHE -U"%SYS" "w ##class(%SYS.System).InstanceGUID()" 

but it results in "<INVALID ARGUMENT>". Is this correct way of running objectscript code on Linux? Sorry if this comes across as a silly question but I am just getting familiar with Cache and its concepts.

Thanks,

Raghu

Bob, Thanks for the link. I did read the Data Integrity guide and understand the recommendations for WIJ and Journal files. BTW, it would be nice to add information about configuring these files in System admin guide. Even though I read the Data integrity guide, my first instinct was to go to admin guide for these kind of details.