RecommendationsPerformance impactConnection type
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: 6
• LTO-4 HH: 6
• LTO-4 FH: 4
• LTO-5: 3
SAS: 3 Gb
GOOD. When fully used, an 6 Gb
high-performance RAID array can support up to the
following number of tape drives:
• LTO-2: 20
• LTO-3: 12
• LTO-4 HH: 12
• LTO-4 FH: 8
• LTO-5: 2
SAS: 6 Gb
If cables not designed for Ultra
320 speeds are used or there are
more than a couple devices on the
bus, the bus may slow down to
Ultra 160 speeds.
• LTO-2: 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 can provide enough bandwidth
for five LTO-2 tape drives.
• LTO-3: 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 tape drive.
• LTO-4 HH: GOOD. When fully used and assum-
ing that the connection to the disks does not
force the speed to a lower parallel SCSI type,
an Ultra 320 connection can provide enough
bandwidth for a single LTO-4 HH tape drive.
• LTO-4 FH: NEUTRAL. When fully used, an Ultra
320 connection provides enough bandwidth
for a single LTO-4 FH tape drive.
• LTO-5: POOR. An Ultra 320 connection is inad-
equate for an LTO-5 tape drive.
Parallel SCSI: Ultra
320
HP StorageWorks MSL2024, MSL4048, MSL8048, and MSL8096 Tape Libraries User and service
guide 169
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