Table 29 Performance impact of various disk connections
(continued)
Recommendations
Performance impact
Connection type
If cables not designed for Ultra 320
speeds are used or there are more
Parallel SCSI: Ultra
320
•
LTO-2:
GOOD
. When fully used and assuming that
the connection to the disks does not force the speed
than a couple devices on the bus, the
to a lower parallel SCSI type, an Ultra 320
bus may slow down to Ultra 160
speeds.
connection can provide enough bandwidth for five
LTO-2 tape drives.
•
LTO-3, LTO-4:
GOOD
. When fully used and
assuming that the connection to the disks does not
force the speed to a lower parallel SCSI type, an
Ultra 320 connection ban provide enough
bandwidth for a single LTO-3 or LTO-4 tape drive.
•
LTO-5:
POOR
. An Ultra 320 connection is
inadequate for an LTO-5 tape drive.
Upgrade to Ultra 320 for parallel SCSI
disk drives when using an LTO-3 or
Parallel SCSI: Ultra
160
•
LTO-2:
GOOD
. When fully used and assuming that
the connection to the disks does not force the speed
LTO-4 tape drive, especially if your
data is greater than 2:1 compressible.
to a lower parallel SCSI type, an Ultra 160
connection can provide enough bandwidth for two
LTO-2 tape drives.
•
LTO-3:
MARGINAL
. An Ultra 160 connection is
barely adequate for an LTO-3 tape drive. The bus
would be saturated when providing 2:1
compressible data to an LTO-3 tape drive.
•
LTO-4 HH:
MARGINAL
. An Ultra 160 connection is
barely adequate for an LTO-4 HH tape drive. The
bus would be saturated when providing 2:1
compressible data to an LTO-4 HH tape drive.
•
LTO-5:
POOR
. An Ultra 160 connection is
inadequate for an LTO-5 tape drive.
Upgrade to Ultra 320 for parallel SCSI
disk drives when using an LTO-3 or
LTO-4 tape drive.
Parallel SCSI: Ultra 2
(80)
•
LTO-2:
MARGINAL
. When fully used and assuming
that the connection to the disks does not force the
speed to a lower parallel SCSI type, an Ultra 2 (80)
connection barely provides enough bandwidth for
an LTO-2 tape drive.
•
LTO-3, LTO-4, LTO-5:
POOR
. An Ultra 2(80)
connection is inadequate for an LTO-3, LTO-4, or
LTO-5 tape drive.
Upgrade to a faster transport medium,
such as Ultra 320 SCSI.
POOR
. Ultra Wide and Fast Wide are inadequate
transport mechanism for LTO tape drives.
Parallel SCSI: Ultra
Wide, Fast Wide
GOOD
. When fully used, a 10 Gigabit Ethernet
connection can provide enough bandwidth for the
following number of tape drives:
Ethernet: 10 Gigabit
•
LTO-2: 14
•
LTO-3 HH: 5
•
LTO-4 HH: 4
•
LTO-5: 2
Performance problems
99
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