2015-05-26 08:56 AM
So, one of the shelves attached to my FAS3250 (CDOT 8.2.3) needs to be replaced. It's nothing urgent, but I do want to make sure I have assessed the impact of a 2-hour-or-so maintenance window where a whole bunch of disks won't be available.
This shelf is home to disks that comprise parts of two aggregates. These two aggregates are home to several dozen volumes, and we can arrange downtime for those volumes on the host side, no problem.
But I've also discovered that these two aggregates are also home to the root volumes of three different vservers. Am I right in thinking that we don't want those volumes to go offline, as it'll mess up access to all the volumes on all three of those vservers?
What am I looking at here in regards to impact and downtime? I reckon I can either:
What are the community's thoughts on this? Is there anything I'm simply not thinking of?
2015-05-27 12:46 AM
Yes, you can migrate any volume non-disruptively to any other aggregate. Alternative is to setup LS mirrors for root volumes and promote mirror copy to be new root. LS mirrors are best practice anyway.
2015-05-27 07:21 AM - edited 2015-05-27 07:21 AM
Yep, I inherited this environment, and some vserver root volumes have LS mirrors, and some don't. Reckon I can set up LS mirrors for those root volumes that don't have them, and then promote one of the mirrors to root well before the maintenance window. That'll take care of root volumes anyway, which is what I'm most concerned about. The rest of the volumes I can migrate to other aggregates and basically ... vacate the two aggregates that are affected by shutting the shelf down.
All that said, the entire workflow could look like this, maybe?
How does that kind of action plan look?
2015-05-27 07:54 AM
It's easier to just move volumes now, for this maintenance, and care about LS mirrors later. You will need to remove all volumes to offline aggregates anyway, so destroy any existing mirrors.