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Drive Performance
Table A-5
Table A-5. Drive Performance
Characteristics
Maximum block size
Data rate, head-to-tape
Data rate of host interface
Maximum rewind time:
from end of any wrap to
logical beginning of tape
(BOT)
Reposition time
Tape load and initialize to
ready
Unload time
Access time (does not
include library timing)
Data buffer size
Read/write speed
Search/rewind speed
Note: Individual results may vary depending on the characteristics of the
95739
shows performance characteristics of the 9840 Tape Drive.
data and other variables.
Ninth Edition
Values
256 kB
Greater than 10 MB/s (see note)
Fibre Channel: burst transmission speed of
100 MB/s (256 kB)
SCSI: 40 MB/s burst synchronous/ ULTRA-1,
differential, wide/fast, negotiable down to
SCSI-1 narrow differential (see note)
ESCON: burst transmission speed of 18 MB/s
(see note)
Approximately 16 s maximum for a 271 m (889
ft) cartridge tape
No penalty
4 s
5 s excluding rewind
8 s for first search
11 s average for subsequent search
8 MB
79 ips (2m/s)
315 ips (greater than 8 m/s)
Drive Performance
A-5
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