SimpleTech ZeusIOPS Manual de usuario descargar pdf (Pagina 54)

54 Zeus

IOPS

3.5-Inch Fibre Channel Solid State Drive Product Manual Rev. 1.0

An Arbitrated Loop has certain rules:

1 Each port on the loop has an Arbitrated Loop Physical Address (AL-PA) that is set on the

“backplane” or the board to where the device is connected. Once set, the port attached to

the backplane inherits the AL-PA.

2 The AL-PA must have “neutral disparity”, i.e., the number of binary 0s and 1s in the AL-PA

are equal when 10-bit encoded. Out of the 127 addresses, one is reserved on the loop for

the fabric switch, leaving 126 possible AL-PAs.

3 There may be more than 126 ports physically attached to the on a loop, but only 126 will

be functional, with the remaining unable to obtain valid addresses.

4 If the AL-PA of a device is not unique on the loop, the device will not participate on the loop.

The user must choose another “hard address”, i.e., an AL-PA. If a unique hard address

cannot be set, the user can set the backplane to an AL-PA so that the loop will assign a

“soft address” to the device.

5 The lower the AL-PA, the higher priority the device has on the loop while keeping “fairness”.

Fairness means that every device on the loop has a chance to own the loop once before

another device owns it twice.

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SimpleTech ZeusIOPS Manual de usuario Pagina 54