Sun Oracle Storage Tek T10000, Reference Manual

Page: 61 / 296

E20425-01 • Chapter 3 Operations 43
Fibre Channel Timers
■
Fibre Channel Timers
StorageTek’s tape drives use the timer values in Table 24 .
Arbitrated Loop Timeout
The Arbitrated Loop timeout value (AL_TIME) is two times the worst case
round-trip latency of a very large loop.
Receiver_Transmitter Timeout
The Receiver_Transmitter timeout value (R_T_TOV) is used by the receiver
logic to detect a loop failure.
Table 24. Timer Summary
Timer Value Implemented By
Initiator Target StorageTek
AL_TIME 15 ms R R Y
R_T_TOV 100 ms R R Y
E_D_TOV Private = 2 sec.
Public = su 2 sec.
R
R
A
2
R
Y
Y
R_A_TOV
SEQ_QUAL
Private = 0 sec.
Public = 10 sec. (note 1)
R A
(note 2)
Y
R_A_TOV
ELS
Private = 2 sec.
Public = 10 sec.
R R Y
RR_TOV
AUTH
2 sec. R Y
RR_TOV
SEQ_INIT
> = R

2 x R_A_TOV
ELS
+ 1 sec.
R Y
REC_TOV > = E 1 sec. (min.) R R Y
ULP_TOV > = Operation specific timer +
2 x RR_TOV R N
Notes:
1. The division of R_A_TOV usage differs from the FC-PH because of the unique characteristics of
an Arbitrated Loop environment.
2. SCSI target devices that support Class 2 are required to implement this timer.