upgrade from 8.4.1 to 9.1

Jun 25, 2022
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hi
i am planning to upgrade a three node cluster to 9.1 from 8.4.1 , and have some question ? hope someone will answer and guide me.
  • Servers:
    3-node cluster (Dell R750), each with 8 NICs configured in a OVS bond setup (LACP). all traffic isolated through vlan, Data and cluster traffic are isolated
  • All of the three server has 2 pcs 1.6 TB each (total 6 ) NVME drive for ceph cluster, version 19.2.1
  • Full Mesh Network for Ceph Server - "broadcast" bond with the 10g interfaces on every node​

question 1- can it be possible to upgrade this to SDN Fabrics introduced in version 9.x onwards ? or keep it as it is ?

question 2:- i want to add 6 more nvme of 3.2tb each to the ceph cluster (2 nvme on each server) - what is the procedure to follow to add this disks without creating any failure, as these server is in 24/7 production use ?
and mixing two different size of disk in the ceph cluster will create any problem ?

kindly guide , help will be valuable for me to decide the next step of upgrade.
thanks