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Fabric OS v6.4.1 Release Notes v1.0 Page 12 of 62

FOS Migration Considerations

This section contains important details to consider before migrating to or from this FOS release.

TSBs - Critical Issues to Consider Prior to Installing This FOS Release

Technical Support Bulletins (TSBs) are produced to provide detailed information about high priority

defects or issues present in FOS releases. The following sections specify all current TSBs that have

been identified as being a risk to or resolved with this specific version of Fabric OS. Please review

carefully and refer to the complete TSB for relevant issues prior to migrating to this version of code.

TSBs can be found at http://my.brocade.com under the “Technical Documentation” section of the

“documentation” tab.

TSB Issues Outstanding in FOS v6.4.1

Issues in the following list of TSBs are known to be potential risks to using FOS v6.4.1 and should be

considered carefully prior to using this release of code:

TSB

TSBTSB

TSB

Summary

SummarySummary

Summary

None

NoneNone

None

There are no current TSBs outstanding

for this FOS release.

TSB Issues Resolved in FOS v6.4.1

Issues in the following list of TSBs are known FOS v6.4.x risks that are not exposures in FOS v6.4.1.

Note that the issues addressed in this list of TSBs may also be resolved in other FOS releases. Refer

to the specific Release Notes for each release to verify resolution details.

TSB

TSBTSB

TSB

Summary

SummarySummary

Summary

None

NoneNone

None

There are no TSBs currently issued for FOS v6.4 releases.

Recommended Migration Paths to FOS v6.4.1

Migrating from FOS v6.2.x

Migrating from FOS v6.2.xMigrating from FOS v6.2.x

Migrating from FOS v6.2.x

For units currently operating at FOS v6.2.x, it is recommended to use FOS v6.3.0d, 6.3.1b (or later) or

v6.3.2 prior to migrating to FOS v6.4.1.

Migrating from FOS v6.3

Migrating from FOS v6.3Migrating from FOS v6.3

Migrating from FOS v6.3.x

.x.x

For units currently operating at FOS v6.3.x, there are no special steps required to migrate to FOS

v6.4.1.

FOS Upgrades and Downgrades

Non-disruptively upgrading to Fabric OS v6.4 is only allowed from Fabric OS v6.3. This policy to support only

one-level non-disruptive migration, which began with FOS v6.0.0, provides more reliable and robust migrations

for customers. By having fewer major changes in internal databases, configurations, and subsystems, the

system is able to perform the upgrade more efficiently, taking less time and ensuring a truly seamless and non-

disruptive process for the fabric. The one-release migration policy also reduces the large number of

upgrade/downgrade permutations that must be tested, allowing Brocade to spend more effort ensuring the

supported migration paths are thoroughly and completely verified.

Disruptive upgrades to Fabric OS 6.4 are allowed and supported from FOS 6.2 and 6.3 (up to a two-level

migration).

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