Keeping the acronyms straight....

Can someone out there explain how the following terms relate to one another?

SCSI
iSCSI
Fibre Channel
SAS

Here is my understanding of things:

SCSI is a standard use to allow computers to communicate with peripheral devices (mainly tape drives and storage, but can also include devices such as scaners, CD-ROM, etc).

iSCSI is is used by a host to communicate with a server, which then communicates with the storage array to retrieve the requested info. This is done over a TCP/IP network.

FC is another protocol that is used by devices in a SAN to communicate with each other via fiber optics.

SAS - not sure what this is, other than "serial attached SCSI".

Is what I said above accurate?

How do these protocols interoperate/interact with on another? I recall reading something about FC carrying SCSI commands. Does SAS also carry SCSI (or iSCSI) commands?

Are SAS and FC considered "carriers" that proivde some type of transport mechanism for SCSI.


Thanks,

Tom