Longhorn overkill for RAID ?
Longhorn overkill for RAID ?
Hello selfhosted !
Continuing my journey of setup up my home k3s cluster.
I’ve been asking myself if Longhorn might be overkill for my home cluster,here’s what i did:
3 machines running k3s each. One of them has a storage in Raid 5 and I dont want to use any storage from the other two.
Thing is, i had to configure replicas to 1 in longhorn for my pv to be green.
Hence my question, since data is already replicated in the array, shouldn’t I just use a NFS storage class instead?
Thanks !
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Longhorn isn't just about replication (which is not backup, and RAID is not backup either). Also if you only have one replica, is it even different from local storage at this point?
You'd use longhorn to make sure applications don't choke and die when the storage they are using go down. Also, I'm not sure if you can supply longhorn storage to nodes that don't run it. I haven't tried it.
I suspect all pods that you'd define to use longhorn would only go up at the longhorn replica node.
All this is how I understand longhorn works. I haven't tried it this way, my only experience is running it on every node so if one node goes down pods can just restart on any other node and carry on.
Hello ! Thanks for your response!
Yes RAID is used as availability of my data here, with or without longhorn, there wouldn’t be much difference there (especially since i only use one specific node)
And you would be right, since the other nodes are unscheduled, it will be available only on my “storage node” so if this one goes down my storage goes down.
That’s why i might be overkill with longhorn, but there are functions to restore and backup to s3 for exemple that i would need to setup i guess