Timers; Arbitrated Loop Timeout; Receiver_Transmitter Timeout; Error_Detect Timeout - Sun Microsystems storagetek sl500 Reference Manual

Timers

Sun StorageTek libraries use the timer values in

TABLE 5-16 Timer Summary

Timer
AL_TIME
R_T_TOV
E_D_TOV
R_A_TOV
SEQ_QUAL
R_A_TOV
ELS
RR_TOV
REC_TOV
ULP_TOV
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.

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.

Error_Detect Timeout

The Error Detect Timeout value (E_D_TOV) is the maximum time permitted for a
Sequence Initiator between the transmission of consecutive data frames within a
single sequence. This is also the minimum time that a Sequence Recipient waits for
the reception of the next frame within a single sequence before recognizing a
Sequence timeout.
E_D_TOV includes the time required to gain access to the loop in addition to the
actual frame transmission time.
96122 • Revision: F
Value
15 ms
100 ms
Private = 2 s
Public = supplied + 2 s
Private = 0 s
Public = 10 s (See note 1)
Private = 2 s
Public = 10 s
300 s
> = E_D_TOV + 1 s
minimum
>= Operation specific
timer + 4 x REC_TOV
TABLE 5-16.
Implemented By
Initiator Target
R R
R R
2
R A
R R
2
R A
R R
R
R R
R
Chapter 5 Fibre Channel Operations 65
FC-2 Features
StorageTek
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