HP 1606 Fabric OS FCIP Administrators Guide v6.4.0 (53-1001766-01, November 20 - Page 37

Open Systems Tape Pipelining, FCIP Fastwrite and OSTP configurations

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Open Systems Tape Pipelining 2 Open Systems Tape Pipelining Open Systems Tape Pipelining (OSTP) can be used to enhance open systems SCSI tape write I/O performance. When the FCIP link is the slowest part of the network, OSTP can provide accelerated speeds for tape read and write I/O over FCIP tunnels. To use OSTP, you need to enable both FCIP Fastwrite and Tape Pipelining. OSTP accelerates SCSI read and write I/Os to sequential devices (such as tape drives) over FCIP, which reduces the number of round-trip times needed to complete the I/O over the IP network and speeds up the process. Each GbE port supports up to 2048 simultaneous accelerated exchanges. Both sides of an FCIP tunnel must have matching configurations for these features to work. FCIP Fastwrite and OSTP are enabled by turning them on during the tunnel configuration process. They are enabled on a per-FCIP tunnel basis. FCIP Fastwrite and OSTP configurations The FCP features used in FCIP fastwrite and OSTP require a deterministic FC Frame path between initiators and targets when multiple tunnels exist. If there are non-controlled parallel (equal cost) tunnels between the same SID/DID pairs, protocol optimization will fail when a command is routed over one tunnel and the response is returned over a different tunnel. To help understand the supported configurations, consider the configurations shown in Figure 8 and Figure 9. In both cases, there are no multiple equal-cost paths. In Figure 8, there is a single tunnel with Fastwrite and OSTP enabled. In Figure 9, there are multiple tunnels, but none of them create a multiple equal-cost path. Connection can be VE-VE or VEX-VE FIGURE 8 Single tunnel, Fastwrite and OSTP enabled Fabric OS FCIP Administrator's Guide 23 53-1001766-01

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Fabric OS FCIP Administrator’s Guide
23
53-1001766-01
Open Systems Tape Pipelining
2
Open Systems Tape Pipelining
Open Systems Tape Pipelining (OSTP) can be used to enhance open systems SCSI tape write I/O
performance. When the FCIP link is the slowest part of the network, OSTP can provide accelerated
speeds for tape read and write I/O over FCIP tunnels. To use OSTP, you need to enable both FCIP
Fastwrite and Tape Pipelining.
OSTP accelerates SCSI read and write I/Os to sequential devices (such as tape drives) over FCIP,
which reduces the number of round-trip times needed to complete the I/O over the IP network and
speeds up the process. Each GbE port supports up to 2048 simultaneous accelerated exchanges.
Both sides of an FCIP tunnel must have matching configurations for these features to work. FCIP
Fastwrite and OSTP are enabled by turning them on during the tunnel configuration process. They
are enabled on a per-FCIP tunnel basis.
FCIP Fastwrite and OSTP configurations
The FCP features used in FCIP fastwrite and OSTP require a deterministic FC Frame path between
initiators and targets when multiple tunnels exist. If there are non-controlled parallel (equal cost)
tunnels between the same SID/DID pairs, protocol optimization will fail when a command is routed
over one tunnel and the response is returned over a different tunnel. To help understand the
supported configurations, consider the configurations shown in
Figure 8
and
Figure 9
. In both
cases, there are no multiple equal-cost paths. In
Figure 8
, there is a single tunnel with Fastwrite
and OSTP enabled. In
Figure 9
, there are multiple tunnels, but none of them create a multiple
equal-cost path.
FIGURE 8
Single tunnel, Fastwrite and OSTP enabled
Connection can be
VE-VE or VEX-VE