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Rules for diskroot selection if multiple are present?

This usually happens during head swap, when new head comes as full filer package with own disks. Then if you simply reassign old filer disks, you end up with two diskroot's. Which one is then selected for booting? Is it random? Or are there any rules for it?

For models with external shelves I always connect new shelves only after head swap is finished. But for the case of integrated disks it is not that easy, and requires more fuss around. The less manual work, the more reliable is procedure

Re: Rules for diskroot selection if multiple are present?

Did you get the information you're looking for?  It wasn't clear from your post if you had a question or were just sharing your experience.

Re: Rules for diskroot selection if multiple are present?

No, I did not get any reply as can be seen here My post has two question marks, so I presumed it is clear where the questions were ...

I did get advice how to force specific aggregate to be disk root for the next boot and used it during head swap. This worked.