I don't believe there are any unmanaged switches being sold. There were however, unmanaged hubs. An unmanaged hub just forwarded frames to the next active port in the loop without the ability to bypass problematic ports.
My advice is to not buy anything that is unmanaged - even if you don't know what the "management" refers to.
Editor's note: Do you agree with this expert's response? If you have more to share, post it in our Storage Networking discussion forum.