HP StorageWorks 2/16V HP StorageWorks Fabric OS 5.3.x administrator guide (569 - Page 393

Supported configurations, Single tunnel, fastwrite and tape pipelining enabled,

Page 393 highlights

Table 99 Using fastwrite and tape pipelining (continued) Fastwrite Tape pipelining 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: • 2 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 tape pipelining 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 Supported 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 Figure 33, there is a single tunnel with fastwrite and tape pipelining enabled. In Figure 34, there are multiple tunnels, but none of them create a multiple equal-cost path. Figure 31 Single tunnel, fastwrite and tape pipelining enabled Connection can be VE-VE or VEX-VE Fabric OS 5.3.0 administrator guide 399

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Fabric OS 5.3.0 administrator guide
399
Supported 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
Figure 33
, there is a single tunnel with
fastwrite and tape pipelining enabled. In
Figure 34
, there are multiple tunnels, but none of them create a
multiple equal-cost path.
Figure 31
Single tunnel, fastwrite and tape pipelining 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:
2 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 tape pipelining 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 99
Using fastwrite and tape pipelining (continued)
Fastwrite
Tape pipelining
Connection can be
VE-VE or VEX-VE