Release Notes

Fabric OS v7.2.0a Release Notes v1.0 Page 18 of 93
FOS Migration Considerations
This section contains important details to consider before migrating to or from this FOS release.
FOS Upgrade and Downgrade Special Considerations
DCX/DCX-4S units running any FOS v7.1 can be non-disruptively upgraded to FOS v7.2.0a. This upgrade is non-
disruptive to both FC and FCoE traffic (when using FCOE10-24 blades).
Any firmware activation on Brocade 7800, or DCX, DCX-4S, DCX 8510-8, DCX 8510-4 with FX8-24 will
disrupt I/O traffic on the FCIP links.
Note:
To achieve non-disruptive firmware upgrade on 5431, 6547 and M6505 embedded switches to FOS
V7.2.0a please follow the instructions given below:
5431:
Upgrade 5431 from FOS v7.0.1_hut to FOS v7.0.1_hut1 before non-disruptively upgrading it to FOS
v7.2.0a.
6547:
Upgrade 6547 from FOS v7.0.0_pha3 to FOS v7.0.0_pha4 before non-disruptively upgrading it to FOS
v7.2.0a.
M6505:
Upgrade M6505 from FOS v7.0.1_ sh to FOS v7.0.1_sh1 before non-disruptively upgrading it to FOS
v7.2.0a.
Disruptive upgrades to Fabric OS v7.2.0a are allowed and supported from FOS v7.0.x (up to a two-level
migration) using the optional “-s” parameter with the firmwaredownload command.
If there are multiple node EGs (encryption groups) in a fabric, please complete firmwaredownload on one node
at a time before downloading on another node.
Recommended Migration Paths to FOS v7.2.0a
Migrating from FOS v7.1
Any 8G or 16G platform running any FOS v7.1. firmware can be non-disruptively upgraded to FOS v7.2.0a.
Migrating from FOS v7.0
Any 8G or 16G platform operating at FOS v7.0.x must be upgraded to FOS v7.1.x before non-disruptively
upgrading to FOS v7.2.0a.
Disruptive upgrade to FOS v7.2.0a from FOS v7.0 is supported.