Dell Brocade 6520 Administrator's Guide Supporting Fabric OS 7.1.0 - Page 529
Supported configurations for QoS zone-based traffic prioritization, ATTENTION
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21 QoS zones Domain 1 Domain 3 8 H1 1 2 9 S1 5 6 Chassis 1 3 4 LS3, FID1 Domain 7 LS4, FID3 Domain 8 10 Base switch Domain 10 11 Domain 2 12 14 13 15 FIGURE 70 = High priority = E_Ports with QoS enabled Traffic prioritization in a logical fabric 8 7 LS1, FID1 Domain 5 LS2, FID3 16 Domain 6 Base switch Domain 9 17 Chassis 2 Supported configurations for QoS zone-based traffic prioritization The following configuration rules apply to QoS zone-based 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 a Brocade 8-Gbps or 16-Gbps switch or port blade. - 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, 6510, 6520, 7500, 7500E, 7600, 7800, 8000, VA-40FC, 48000, Brocade DCX, DCX-4S, or DCX 8510 family. • QoS is enabled by default on 8-Gbps and 16-Gbps ports. QoS is disabled by default on all 4-Gbps ports and long-distance ports. Limitations and restrictions for QoS zone-based traffic prioritization • Enabling and disabling QoS is potentially disruptive to the I/O on the affected port. • 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. Fabric OS Administrator's Guide 529 53-1002745-02
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