you can two solutions:  1. bind a very small LUN - 1MB - and assign it HLU 0 when you add it to the storage group but before you click apply - in the box when the HLU is locationed you can right-click to select the number  2. disable arraycommpath - this is really only used when you first connect a host to the array - it provides a target - PowerPath uses it to set up the first time - once all your LUNs are assigned, you can disable. Changing the arraycommpath requires a host reboot/reconfig  glen ----------------------------------------------------------------------------------------------------------------- emc107962  The arraycommpath option enables or disables a communication path from  the server to the storage system when LUN 0 is not configured on the  storage system. Enabling arraycommpath from Navisphere instructs the  array to present a LUNZ whenever a host LUN0 does not exist. If a host  LUN0 is available to the server (LUN0 bound and no Access Logix or LUN0  in the Storage Group for the initiator), the status of arraycommpath  does not matter.  If arraycommpath is not set appropriately at initial  host and array configuration, the host will not be able to see the  storage system or the LUNs (in which case PowerPath and failover is  irrelevant).  In summary, arraycommpath does not play any role in  failover.  That is done by the failovermode setting. Refer to solution emc99467 for information on the correct arraycommpath settings for all supported  operating systems. ----------------------------------------------------------------------------------------------------------------------- emc76273 -       How to change  arraycommpath and failovermode settings using navicli  Note: Changing these parameters may cause the storage system to reboot. Failovermode Use the following Navisphere CLI command to configure failovermode:     navicli -h  <SP_IP_address> storagegroup -sethost -host <hostname>  -failovermode X  Where X=0, 1, or 2 ----------------------------------------------------------------------------------------------------------------  Message was edited by: kelleg
Do we always need to have HLU 0 in every storage grp. last week we had an issue. EMC recommenced us to have 1GB LUN with HLU 0 and this will remove the LUNZ.
HLU 0/LUNZ