Dell Brocade 6510 Fabric OS Administrator's Guide v7.1.0 - Page 126
Lossless core, Adding a slave E_Port
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4 Lossless Dynamic Load Sharing on ports You can disable or enable IOD when Lossless DLS is enabled. You can also choose between exchange- or port-based policies with Lossless DLS. Events that cause a rebalance include the following: • Adding an E_Port • Adding a slave E_Port • Removing an E_Port (However, frame loss occurs on traffic flows to this port.) • Removing an F_Port (However, frame loss occurs on traffic flows to this port.) Lossless DLS does the following whenever paths need to be rebalanced: 1. Pauses ingress traffic by not returning credits. Frames that are already in transit are not dropped. 2. Changes the existing path to a more optimal path. 3. If IOD is enabled, waits for sufficient time for frames already received to be transmitted. This is needed to maintain IOD. 4. Resumes traffic. Table 11 shows the effect of frames when you have a specific routing policy turned on with IOD. TABLE 11 Policy Combinations of routing policy and IOD with Lossless DLS enabled IOD Rebalance result with Lossless DLS enabled Port-based Port-based Disabled Enabled Exchange-based Disabled Exchange-based Enabled Device-based Device-based Disabled Enabled No frame loss, but out-of-order frames may occur. No frame loss and no out-of-order frames. Topology restrictions apply. Intended for FICON environment. No frame loss, but out-of-order frames may occur. No frame loss and no out-of-order frames. Topology restrictions apply. Intended for FICON environment. No frame loss, but out-of-order frames may occur. No frame loss and no out-of-order frames. Topology restrictions apply. Intended for FICON environment. Lossless core Lossless core works with the default configuration of the Brocade DCX 8510-8 and DCX 8510-4 hardware to prevent frame loss during a core blade removal and insertion. This feature is on by default and cannot be disabled. Lossless core has the following limitations: • Only supported with IOD disabled, which means Lossless core cannot guarantee in-order delivery of exchanges • ICL limitations • Traffic flow limitations 126 Fabric OS Administrator's Guide 53-1002745-02
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