Technical data
30 Fabric OS FCIP Administrator’s Guide
53-1002474-01
Open Systems Tape Pipelining
2
Enabling IPsec and IKE policies
IPsec is enabled as an option of the portcfg fciptunnel create and modify commands. The -i option
activates IPsec. The -K option specifies the IKE key. The -l (legacy) option specifies to use the IPsec
connection process compatible with Fabric OS releases prior to v7.0.0. Note that this option is a
disruptive modify request that causes the tunnel to bounce.
The IKE key must be a shared 32-character string. Both ends of the secure tunnel must be
configured with the same key string. If both ends are not configured with the same key, the tunnel
will not come up. The following examples show IPsec and IKE keys enabled for traffic from VE_Ports
16 and 17 across multiple FCIP circuits.
portcfg fciptunnel 16 create 192.168.0.90 192.168.0.80 50000 -x 0 -d c0 -i
-K12345678901234567890123456789012 -l
portcfg fcipcircuit 16 create 1 192.168.1.90 192.168.1.80 50000 -x 0
portcfg fcipcircuit 16 create 2 192.168.2.90 192.168.2.80 50000 -x 0
portcfg fcipcircuit 16 create 3 192.168.3.90 192.168.3.80 50000 -x 0
portcfg fcipcircuit 16 create 4 192.168.4.90 192.168.4.80 50000 -x 0
portcfg fcipcircuit 16 create 5 192.168.5.90 192.168.5.80 50000 -x 0
portcfg fciptunnel 17 create 192.168.0.91 192.168.0.81 50000 -x 0 -d c0 -i
-K12345678901234567890123456789012 -l
portcfg fcipcircuit 17 create 1 192.168.1.91 192.168.1.81 50000 -x 0
portcfg fcipcircuit 17 create 2 192.168.2.91 192.168.2.81 50000 -x 0
portcfg fcipcircuit 17 create 3 192.168.3.91 192.168.3.81 50000 -x 0
portcfg fcipcircuit 17 create 4 192.168.4.91 192.168.4.81 50000 -x 0
portcfg fcipcircuit 17 create 5 192.168.5.91 192.168.5.81 50000 -x 0
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 must 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 on page 31.
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.