.png "vitaprimo"){kind=avatar}
I'm upgrading the infrastructure and I need to take the last host off from a cluster with VSAN enabled; basically it's a group of disks contained within a host, within a cluster with no other host in it. I thought about vMotion the VMs to other ESXi hosts but there aren't any online so I have to find a way of breaking the VSAN group apart without moving the VMs. Is this possible?
The any other way I could come up with is using storage vMotion only and use external storage instead, that way the VMs keep using the same hosts but are taken of the VSAN group and the downtime would be minimal, only the time the host takes to restart but I'm hoping if this can be avoided as I'd need to move all that data back. VSAN is still going to be breaked off, it's not just a restart, the host need to be taken off the uni-host cluster. There is a spare disk in the host unclaimed by VSAN but it's smaller than the required for all the VMs, I thought about moving part there, part off-host but I can't remember why is it there and why is it unclaimed so I'm a little uneasy about pushing its limits, also, I'm not sure if that'd let me take the host off the cluster, it's been a while since last time I've done this. Any advice?
I'll appreciate millions your advice, thanks! 
I kept repeating the same to make in an attempt to clear things up but it backfired, I'm sorry; today I'm well rested though, what I wanted was to break off the VSAN volume and separate the its data to its discrete disks. Before giving up and going to sleep I left vCenter moving the data to central NFS stores; I didn't want to do this because of the traffic, disk wear and to avoid moving back the data--but it's all done.
Nevertheless thanks for your advise, and for the new terms I didn't know before, it's going to be my next weekend project.
I'm sorry about the delay. It's been hell the last months, I lost every VM thanks to bad Microsoft virtualization attempts of software. I have no idea how but when I started over vCenter was able to recover some clones and stuff I had laying around; stuff I do to test and never delete, that, that was never meant to be a backup or use for any other reason than to try out features or systems saved me. Well, that and iCloud, I had an emergency copy of the root's PFX, with only two clones and this tiny KB-sized file I was able to recreate everything, VMware is completely worth it, the really hard process this all takes was vastly shortened by vCenter cloning feature, Active Directory got really messed up so it all was still hard, but I could just clone another VM and try again. The other cloning "solution" still requires to set up and activate and all the checklist of getting a computer hand taking all the carton out, VMware doesn't it just works every time, as long as it is resource-happy.
Oh, vSAN is turned off now, BTW. It wasn't turned off they way I expected it to but it's off.