Troubleshooting Cloning – Part 1

I’ve had some issues with cloning recently. It’s been an interesting issue that will require some more analysis, but for now I have a work around that has helped narrow the issue down.  It all started with this error on a running clone:

Waiting for 1 Writable volume on backup pool ‘Device’ disk(s) on nsr_server

After checking the device is mounted I started to search for other issues. As usual I found a great post over at Preston’s blog. There he explains:

“A core component in NetWorker’s media database design is that a saveset can only ever have one instance on a piece of media. This applies as equally to failed as complete saveset instances.The net result is that this error/situation will occur because it’s meant to – NetWorker doesn’t permit more than one instance of a saveset to appear on the same piece of physical media.”

So what I surmise happens is there is a failure during the clone operation. The aborted saveset on the destination needs to be removed or excluded. I have not been able to formulate an mminfo command to find aborted clone savesets yet? See part 2 when published. For now I would be satisfied to exclude the savesets. This specific clone job in question provides DR protection for one of my NetWorker servers. That is, it clones index, bootstrap and filesystem saves to an offsite DD. For reasons I cannot explain here at this time this clone was configured to go back 6 months. I know.

 

 

So after the clone had run for a few minutes I opened the clone properties and hit the “Preview saveset” button. What I found was there was a particular group of savesets from a specific date in the past identified and that date alone. My assumption is those savesets already exist on the destination and the clone job is not intelligent enough to identify and skip. The error “waiting for volume” is really misleading, at least to me. After greatly narrowing to number of days to look back and rerunning the clone job completed successfully.

Stay tuned for Part 2 -Identifying aborted clone savesets. Do you know how? Comment below!

Category: Cloning, NetWorker |

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