I don't quite understand your question. You have a 4 node cluster, with one pair of FAS8060s and one of FAS8080s? These platforms are both still supported by current versions of ONTAP, and we will provide support contracts through end of 2022 on them.
What challenges are you facing? What does your budget look like? What is your driver for change?
Current platforms are FAS2600(AFFA200), FAS8200(AFFA300) and FAS9000(AFFA700), and are available with spinning disk, SSD or hybrid configurations. We also have an all flash compact high performance unit, the A700s.
System sizing aspects include capacity, performance, parallelism, as well as constraints such as budget, space, power and cooling, and enhancements such as support levels and software licensing. This topic is probably too complex and commercially sensitive to cover on our forums.
At a broad stroke, a single HA pair of FAS9000 systems will likely meet your requirements, but without detailed analysis of your environment, we couldn't say that is the correct choice for you.
Your leasing reseller should be able to work with you to identify your sizing requirements for a replacement system.
Yes, with Clustered ONTAP you can add a new set of nodes and drives to the cluster and move the data across using "vol move" functionality, just as if you were moving it between the existing four nodes. You will need appropriate cables/SFP+/optical fibre to connect all 6 nodes simultaneously to the cluster switches for migration. Post migration, you would unjoin the departing nodes, and then convert the cluster to switchless clustering.
Or if you own the disks but not the controllers, we have a "non-disruptive headswap" procedure using aggregate relocation available for our services partners. This is a safe, but complex, activity that we only support for trained technicians.
For your 2nd option, if I wanted to migrate an aggr including data on it to another node and in the other HA pair, we have to reconnect all shelves associated with aggr to the target node, in this way, I don’t have to run vol move because it will take long time for a large amount of data. Can we achieve that?
I am not seeking a way to do it myself, but just essential steps for what options we can have
There is no documented way to move shelf with data between nodes in cDOT. Option 2 is about replacing nodes themselves. Nodes fully retain their identity in cluster, their shelves still continue to belong them.
I need to keep an aggr from one of 2 away nodes. So, my question is if I can move the aggregate over to the other existing HA pair in the same cluster, then without moving data on the aggr.
The following is the doc I found and sounds like it can do the work. However, I DO recognize that this doc is for 7-mode, not for CDOT. Are there any precedures we can do to achieve the same for CDOT cluster?
Can headswap happen between two existing HA pairs in the same cluster? In another words, move all existing aggrs from one HA pair to the other that has had its own existing aggrs, and then retire the HA pair? Assuming they are both FAS nodes, and accepting HA can accept enough shelve.
Sorry for the delay in response. Our procedure for aggregate relocation does not cover a many to one scenario, only a one to one.
From a technical point of view, it might work - but from a practical point of view, if anything went wrong, it could be a bad scenario for you. It is not something documented in our procedure for aggregate relocation, which assumes the existing target does not have any disks - specifically saying "This procedure assumes that the replacement controller hardware is new and has not been used."
For the safety of your data you should assume it will not work and pursue consolidation options through vol move, potentially onto swing disks, or do 2x8060HA to 2x8200HA.