Converting From Iscsi To Fc/Iscsi; Converting From Fc/Iscsi To Fc - Lenovo ThinkSystem DE Series Hardware Installation And Maintenance Manual

Converting from iSCSI to FC/iSCSI

• If you plan to convert a port that is being used for mirroring, you must move the mirroring relationships to
a port that will remain iSCSI after the conversion. Otherwise, the communication link might be down after
the conversion because of a protocol mismatch between the new FC port on the local array and the
existing iSCSI port on the remote array.
• If you plan to convert the ports that are not being used for mirroring, asynchronous mirroring operations
will be unaffected. Before applying the feature pack, you should confirm that all mirror consistency groups
are synchronized. After applying the feature pack, you should test the communication between the local
storage array and the remote storage array.

Converting from FC/iSCSI to FC

• When converting all host ports to FC, keep in mind that asynchronous mirroring over FC must occur on
the highest-numbered FC port.
• If you plan to convert the ports being used for mirrored relationships, you must deactivate these
relationships before applying the feature pack.
Attention: Possible data loss – If you do not delete the asynchronous mirroring relationships that
occurred over iSCSI before converting the ports to FC, the controllers might lock down, and you might
lose data.
• If the storage array currently has iSCSI baseboard ports and FC HIC ports, asynchronous mirroring
operations will be unaffected. Before and after the conversion, mirroring will occur on the highest-
numbered FC port, which will remain the HIC port labeled 2 in the figure. Before applying the feature pack,
you should confirm that all mirror consistency groups are synchronized. After applying the feature pack,
you should test the communication between the local storage array and the remote storage array.
• If the storage array currently has FC baseboard ports and iSCSI HIC ports, you must delete any mirroring
relationships that occur over FC before applying the feature pack. When you apply the feature pack,
mirroring support will move from the highest-numbered baseboard host port (labeled 1 in the figure) to the
highest-numbered HIC port (labeled 2 in the figure).
Before the conversion
Baseboard
ports HIC ports
iSCSI
FC iSCSI
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ThinkSystem DE Series Hardware Installation and Maintenance Guide for 2U Enclosures
Port used for
mirroring
FC
After the conversion
Baseboard
ports HIC ports
FC FC
FC FC
Port used for
mirroring Required steps
Synchronize
mirror
consistency
groups before
and test
communications
after
Delete mirroring
relationships
before and re-
establish
mirroring after