Hi . Is longhorn able to use kubernetes's external iscsi volumes as storage? I have longhorn installed inside a kubernetes cluster. We also have a equallogic disks cabin and also a couple of linux nfs servers (which I want to setup also iscsi daemon). Can the kubernetes's Longhorn use the equalogic disks and the linux iscsi servers as storage to provide volumes to the kubernetes pods?

Longhorn is meant to be used to aggregate and replicate using local disk from the compute nodes, what’s known as converged storage. If you have an existing external storage system, the best practice would probably be to use that via the vendor-provided CSI driver. Nesting storage systems (putting replicated block storage on top of other replicated block storage) wouldn’t perform very well, nor would it give you any real benefits.