The compute service outage is very rare. So this kind of failover is overkill. The main problem is storage. You need to have a shared storage between instances. And there is a trap. The storagenode is not compatible with any network connected storage in general, especially NFS and SMB. The only compatible protocol is iSCSI. But it is not so easy as you may thinking. Any problem with network - your storage is disconnected and you can lost pieces and got disqualified. So you will be forced to backup your network too (have a separate network for storage with duplication on case of outage) and so on.
I would not recommend to go this way. Keep configuration as simple as possible.
One node - one local connected HDD.
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