7.1.3. 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 as described below.
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, check
Lenovo Storage Interoperation Center (LSIC) to 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.
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.
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