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Storage : LUNs : Understanding LUNs : Guidelines for mapping LUNs to igroups
Guidelines for mapping LUNs to igroups
There are several important guidelines that you must follow when mapping LUNs to an igroup.
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You can map two different LUNs with the same LUN ID to two different igroups without having a conflict, provided that the igroups do not share any initiators or only one of the LUNs is online at a given time.
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You should ensure that the LUNs are online before mapping them to an igroup. You should not map LUNs that are in the offline state.
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You can map a LUN only once to an igroup.
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You can map a LUN only once to a specific initiator through the igroup.
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You can add a single initiator to multiple igroups, but the initiator can be mapped to a LUN only once. You cannot map a LUN to multiple igroups that contain the same initiator.
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You cannot use the same LUN ID for two LUNs mapped to the same igroup.
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You cannot map a LUN to both FC and iSCSI igroups if ALUA is enabled on one of the igroups.

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