Справочник Пользователя для Exabyte EXB-8505 8mm
Performance Specifications
This section describes the performance specifications for the tape
drive.
drive.
Write and Read Access Times
Write access time starts when the tape drive receives the last byte of
the WRITE command (that is, when the initiator de-asserts ACK) and
ends when the tape drive asserts REQ to request that the initiator
transfer the first data byte across the SCSI bus.
the WRITE command (that is, when the initiator de-asserts ACK) and
ends when the tape drive asserts REQ to request that the initiator
transfer the first data byte across the SCSI bus.
Read access time starts when the tape drive receives the last byte of
the READ command (that is, when the initiator de-asserts ACK) and
ends when the tape drive asserts REQ to indicate that it is ready to
transfer the first data byte across the SCSI bus to the initiator.
the READ command (that is, when the initiator de-asserts ACK) and
ends when the tape drive asserts REQ to indicate that it is ready to
transfer the first data byte across the SCSI bus to the initiator.
Write and read access times depend on whether the tape drive is
operating in start/stop mode or streaming mode.
operating in start/stop mode or streaming mode.
Mode
Typical write access
time
Typical read access
time
Start/stop
1.7 msec
1.8 msec
Streaming
3.1 msec
3.2 msec
Note:
The measurement of write access time does not include the
initial WRITE command received after the mode is changed
from read to write.
initial WRITE command received after the mode is changed
from read to write.
Table 6-1 Typical write and read access times
6-2
EXB-8205 and EXB-8505
510504
(Standard and XL)
6 Functional Specifications