HP 1606 Fabric OS FCIP Administrators Guide v6.4.0 (53-1001766-01, November 20 - Page 67

FCIP Fastwrite and OSTP configurations, TABLE 12

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Options for enhancing tape I/O performance 3 TABLE 12 Using FCIP Fastwrite and OSTP (Continued) FCIP Fastwrite OSTP Class 3 traffic is accelerated with Fastwrite. Class 3 traffic is accelerated between host and sequential device. With sequential devices (tape drives), there are 1024 initiator-tape (IT) pairs per GbE port, but 2048 initiator-tape-LUN (ITL) pairs per GbE port. The ITL pairs are shared among the IT pairs. For example: Two ITL pairs for each IT pair as long as the target has two LUNs. If a target has 32 LUNs, 32 ITL pairs for IT pairs. In this case, only 64 IT pairs are associated with ITL pairs. The rest of the IT pairs are not associated to any ITL pairs, so no OSTP is performed for those pairs. By default, only Fastwrite-based acceleration is performed on the unassociated pairs. Does not support multiple non-equal-cost path between host and sequential device FCIP Fastwrite and OSTP configurations To help understand the supported configurations, consider the configurations shown in the two figures below. In both cases, there are no multiple equal-cost paths. In the first figure, there is a single tunnel with Fastwrite and OSTP enabled. In the second figure, there are multiple tunnels, but none of them create a multiple equal-cost path. Connection can be VE-VE or VEX-VE FIGURE 16 Single tunnel, Fastwrite and OSTP enabled Fabric OS FCIP Administrator's Guide 53 53-1001766-01

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Fabric OS FCIP Administrator’s Guide
53
53-1001766-01
Options for enhancing tape I/O performance
3
FCIP Fastwrite and OSTP configurations
To help understand the supported configurations, consider the configurations shown in the two
figures below. In both cases, there are no multiple equal-cost paths. In the first figure, there is a
single tunnel with Fastwrite and OSTP enabled. In the second figure, there are multiple tunnels, but
none of them create a multiple equal-cost path.
FIGURE 16
Single tunnel, Fastwrite and OSTP enabled
Class 3 traffic is accelerated with Fastwrite.
Class 3 traffic is accelerated between host and
sequential device.
With sequential devices (tape drives), there are 1024
initiator-tape (IT) pairs per GbE port, but 2048
initiator-tape-LUN (ITL) pairs per GbE port. The ITL pairs
are shared among the IT pairs. For example:
Two ITL pairs for each IT pair as long as the target has
two LUNs.
If a target has 32 LUNs, 32 ITL pairs for IT pairs. In this
case, only 64 IT pairs are associated with ITL pairs.
The rest of the IT pairs are not associated to any ITL
pairs, so no OSTP is performed for those pairs. By
default, only Fastwrite-based acceleration is performed
on the unassociated pairs.
Does not support multiple non-equal-cost path
between host and sequential device
TABLE 12
Using FCIP Fastwrite and OSTP (Continued)
FCIP Fastwrite
OSTP
Connection can be
VE-VE or VEX-VE