HP StorageWorks 8/80 Brocade Fabric OS Administrator's Guide v6.3.0 (53-100133 - Page 462
High availability considerations for traffic prioritization
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18 QoS: SID/DID traffic prioritization High availability considerations for traffic prioritization If the standby CP is running a Fabric OS version earlier than 6.3.0 and is synchronized with the active CP, then QoS zones using D,I notation cannot be created. If the standby CP is not synchronized or if no standby CP exists, then the QoS zone creation succeeds. If QoS zones using D,I notation exist in either the defined or active configuration and the standby CP tries to synchronize with the active CP, the synchronization fails if the standby CP is running a Fabric OS version earlier than 6.3.0. Synchronization can succeed only if the QoS D,I zones are removed. Supported configurations for traffic prioritization Note the following configuration rules for traffic prioritization: • All switches in the fabric must be running Fabric OS v6.0.0 or later. ATTENTION If QoS traffic crosses an ISL for a switch running a firmware version earlier than Fabric OS v6.0.0, the frames are dropped. • By default, all devices are assigned medium priority. - To be assigned high or low priority, hosts and targets must be connected to one of the following: • Brocade 300 • Brocade 5100 • Brocade 5300 • Brocade 5410 • Brocade 5424 • Brocade 5450 • Brocade 5480 • FC8-16, FC8-32, or FC8-48 port blade in the Brocade DCX or DCX-4S platform. - To preserve the priority level across ISLs, the switches must be running Fabric OS v6.0.0 or later and must be one of the following platforms: Brocade 300, 4100, 4900, 5000, 5100, 5300, 5410, 5424, 5450, 5480, 7500, 7500E, 7600, 7800, 8000, 48000, Brocade DCX, or DCX-4S. Limitations and restrictions for traffic prioritization Note the following configuration rules for traffic prioritization: • If a host and target are included in two or more QoS zones with different priorities, the zone with the lowest priority takes precedence. For example, if an effective zone configuration has QOSH_z1 (H,T) and QOSL_z2 (H,T), the traffic flow between H and T will be of low QoS priority. Additionally, if QOSH_z1 (H,T) overlaps with a "domain,port" zone at the H port, the traffic flow between H and T is dropped to medium priority and the H port is marked as a session-based zoning port. • Traffic prioritization is enforced on the egress ports only, not on the ingress ports. 420 Fabric OS Administrator's Guide 53-1001336-01
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