## `6120loop` Test Options

The `6120loop`(1M) test tests the functions of the Sun StorEdge 6120 array controller. Each controller has three SIMs (chips) that run the Fibre Channel loops inside and outside the array.

Note -

There is one front-end SIM and two back-end SIMs per controller. The two back-end sims control the two back-end loops. For each SIM, you can run the same tests, so most of the options are to specify on which SIM the diagnostic tests will run.
Each SIM has three loops: an internal 1-bit loop, an internal 10-bit loop, and an external loop. The `6120loop`(1M) test runs on the external loop, and each SIM can run the same diagnostics with one exception: If the Sun StorEdge 6120 array is attached to a fabric instead of an arbitrated loop, the front-end SIM will automatically run an `echo_test` on its external loop.