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Fabric OS Administrator’s Guide
53-1001763-02
Lossless Dynamic Load Sharing on ports
4
Lossless core
Lossless core works with the default configuration of the Brocade DCX and DCX-4S 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.
ICL Limitations
If ICL ports are connected during a core blade removal, then it is equivalent to removing external
E_Ports which cause I/O disruption on the ICL ports that have been removed.
If ICL ports are connected during a core blade insertion, then it is equivalent to adding external
E_Ports which may cause I/O disruption due to reroutes. Lossless DLS, if enabled, takes effect to
prevent I/O disruption.
Traffic flow limitations
The FA4-18 and FR4-18i
AP blades, which are supported on the Brocade DCX and DCX-4S, may
continue to experience frame drops after core blade removal or insertion. The path between an
FC10-6, FA4-18, and FR4-18i blade and an FX8-24 blade, or vice-versa, will experience I/O
disruption because the FC10-6, FA4-18, and FR4-18i blades do not support this feature.
Configuring Lossless Dynamic Load Sharing
You configure Lossless DLS switch- or chassis-wide by using the dlsSet command to specify that no
frames are dropped while rebalancing or rerouting traffic.
1. Connect to the switch and log in using an account assigned to the admin role.
2. Enter the appropriate dlsSet command to enable or disable Lossless Dynamic Load Sharing.
switch:admin>
dlsset --enable lossLess
switch:admin>
dlsset --disable lossLess
Lossless Dynamic Load Sharing in Virtual Fabrics
Enabling Lossless Dynamic Load Sharing is optional on logical switches in a Virtual Fabric. If you
enable this feature, it must be on a per logical switch basis and can affect other logical switches in
the fabric.XISL use must be disabled for Lossless DLS to be enabled
Exchange-based
Disabled
No frame loss, but out of order frames may occur.
Exchange-based
Enabled
No frame loss and no out of order frames. Topology restrictions apply. Intended
for FICON environment.
TABLE 9
Combinations of routing policy and IOD with Lossless DLS enabled (Continued)
Policy
IOD
Rebalance result with Lossless DLS enabled
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Страница 54: ...14 Fabric OS Administrator s Guide 53 1001763 02 High availability of daemon processes 1 ...
Страница 74: ...34 Fabric OS Administrator s Guide 53 1001763 02 Basic connections 2 ...
Страница 102: ...62 Fabric OS Administrator s Guide 53 1001763 02 Audit log configuration 3 ...
Страница 156: ...116 Fabric OS Administrator s Guide 53 1001763 02 The authentication model using RADIUS and LDAP 5 ...
Страница 214: ...174 Fabric OS Administrator s Guide 53 1001763 02 Management interface security 7 ...
Страница 228: ...188 Fabric OS Administrator s Guide 53 1001763 02 Brocade configuration form 8 ...
Страница 276: ...236 Fabric OS Administrator s Guide 53 1001763 02 Creating a logical fabric using XISLs 10 ...
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Страница 440: ...400 Fabric OS Administrator s Guide 53 1001763 02 Performance data collection 17 ...
Страница 464: ...424 Fabric OS Administrator s Guide 53 1001763 02 Disabling bottleneck detection on a switch 18 ...
Страница 480: ...440 Fabric OS Administrator s Guide 53 1001763 02 F_Port masterless trunking 19 ...
Страница 494: ...454 Fabric OS Administrator s Guide 53 1001763 02 Buffer credit recovery 20 ...
Страница 560: ...520 Fabric OS Administrator s Guide 53 1001763 02 Port indexing on the Brocade DCX 4S backbone C ...
Страница 574: ...534 Fabric OS Administrator s Guide 53 1001763 02 Hexadecimal overview E ...