Section 4: SCSI Bridge Electronics
Figure 42
Tape drive performance LCD format
2.3.1 Current
Tape
Operation
The SCSI command being executed displays on the top line of the LCD
.
Typical commands shown
are
Read, Write, WrtFMK, Rewind, Space,
and so on.
Write
E F
TOTL XFR
74MB
Figure 43
Current tape operation display
Additionally, off-line utilities use this area to display tape-drive errors. The SCSI
Request Sense
command provides information about an error.
2.3.2 Total
Data
Transferred
Total data bytes read or written from the tape drive appear with a
KB
(1024),
MB
(1024 x 1024)
or
GB
(1024 x 1024 x 1024) multiplier. On the first read or write command following a rewind,
the count is set to zero.
Write
E F
TOTL XFR
74MB
Figure 44
Total data transferred LCD
2.3.3
Transfer Rates in Kbytes per Second
The average transfer rate between the NonStop server and the tape drive is calculated by dividing
the total data transferred by the elapsed time since the first read or write command following a
rewind or write filemark.
HP StorageWorks DAT 72 (Models 5242 and 5242-ACL) User's Guide
51 HP Part Number 528296-03 July 2005
