• Dual-protocol SFP transceivers support both FC (at 4 Gbps, 8 Gbps, 16 Gbps,) and iSCSI (at 10 Gbps),
but they do not support 1 Gbps iSCSI. See Determine whether you have dual-protocol SFPsto determine
what type of SFP transceivers are installed.
Considerations for changing the host protocol
The considerations for changing the host protocol depend on the starting and ending protocols of the
baseboard host ports and the HIC ports.
If you use a Mirroring feature or the Data Assurance (DA) feature, you must understand what happens to
these features when you change the host port protocol.
Note:
The following considerations apply only if you are converting a storage array that has already been in
use. These considerations do not apply if you are converting a new storage array that does not yet have
hosts and volumes defined.
Converting from FC to iSCSI
• If your configuration contains SAN Boot hosts connected to the FC baseboard ports, ensure that the
configuration is supported on iSCSI. If it is not, you cannot convert the host protocol to iSCSI.
• The DA feature is not supported for iSCSI.
– If you are currently using DA and you want to convert FC host ports to iSCSI, you must disable DA on
all volumes.
– If you do not deactivate DA before converting to iSCSI, the storage array will be out of compliance after
the conversion.
• The Synchronous Mirroring feature is not supported for iSCSI.
– If you are currently using Synchronous Mirroring relationships and you want to convert FC host ports to
iSCSI, you must deactivate Synchronous Mirroring.
– Refer to the online help for ThinkSystem System Manager to remove all synchronous mirrored pairs,
which removes mirror relationships on the local storage array and on the remote storage array. In
addition, follow the instructions in the online help to deactivate Synchronous Mirroring.
Attention:
If you do not deactivate Synchronous Mirroring relationships before converting to iSCSI,
your system will lose data access and data loss might occur.
• Asynchronous Mirroring requires both the local storage array and the remote storage array to use the
same protocol.
– If you are currently using Asynchronous Mirroring and you want to convert all host ports from FC to
iSCSI, you must deactivate Asynchronous Mirroring before applying the feature pack.
– Refer to the online help for ThinkSystem System Manager to delete all mirror consistency groups and
remove all mirrored pairs from the local and remote storage arrays. In addition, follow the instructions in
the online help to deactivate Asynchronous Mirroring.
Converting from iSCSI to FC
• Asynchronous Mirroring requires both the local storage array and the remote storage array to use the
same protocol. If you are currently using Asynchronous Mirroring with the baseboard ports, you must
deactivate Asynchronous Mirroring before changing the protocol.
• Refer to the online help for ThinkSystem System Manager to delete all mirror consistency groups and
remove all mirrored pairs from the local and remote storage arrays. In addition, follow the instructions in
the online help to deactivate Asynchronous Mirroring.
Converting from FC to FC/iSCSI
Mirroring considerations
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