HP StorageWorks 1/8, User'S And Service Manual, Page: 120 / 204

enough data for the tape drives to write at full speed. Find the performance impact of your system's
disk connection in
Table 29 .
Table 29 Performance impact of various disk connections
Recommendations Performance impact Connection type
For good performance, use a
faster connection with LTO-3,
LTO-4, and LTO-5 tape drives.
• LTO-2: GOOD . When fully used, a 1 Gb fibre
connection can provide enough bandwidth for
two LTO-2 tape drives.
• LTO-3, LTO-4, LTO-5: POOR . A 1 Gb fibre
connection is inadequate for an LTO-3, LTO-4,
or LTO-5 tape drive.
Fibre: 1 Gb
For good performance, use a
faster connection if you have
multiple LTO-3 or LTO-4 tape
drives, or an LTO-5 tape drive.
• LTO-2: GOOD . When fully used, a 2 Gb fibre
connection can provide enough bandwidth for
4 LTO-2 tape drives.
• LTO-3: GOOD . When fully used, a 2 Gb fibre
connection can provide enough bandwidth for
an LTO-3 tape drive.
• LTO-4 HH: GOOD . When fully used, a 2 Gb
fibre connection can provide enough bandwidth
for an LTO-4 HH tape drive.
• LTO-5: POOR . A 2 Gb fibre connection is inad-
equate for an LTO-5 tape drive.
Fibre: 2 Gb
GOOD . When fully used, a 4 Gb fibre connection
can provide enough bandwidth for the following
number of tape drives:
• LTO-2: 8
• LTO-3 HH: 4
• LTO-4 HH: 2
• LTO-5: 1
Fibre: 4 Gb
GOOD . When fully used, an 8 Gb fibre connection
can provide enough bandwidth for the following
number of tape drives:
• LTO-2: 16
• LTO-3 HH: 6
• LTO-4 HH: 3
• LTO-5: 2
Fibre: 8 Gb
GOOD . When fully used, a 3 Gb high-performance
RAID array can support up to the following number
of tape drives:
• LTO-2: 10
• LTO-3, LTO-4: 6
• LTO-5: 3
SAS: 3 Gb
Troubleshooting 120