Noting more configuration ,if I configure openfiler  as a iSCSI Lun able to detect the lun , moment I configure EMC Lun unable to detect the Lun ID .
Any other configs do I need to do in Host ? any comands to delete the old Lun ID ?
.[root@pbuovirt3 ~]# cat /proc/scsi/scsi 
Attached devices:
Host: scsi0 Channel: 03 Id: 00 Lun: 00
  Vendor: HP       Model: P410i            Rev: 2.00
  Type:   RAID                             ANSI  SCSI revision: 00
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: HP       Model: LOGICAL VOLUME   Rev: 2.00
  Type:   Direct-Access                    ANSI  SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
  Vendor: Optiarc  Model: DVD RW AD-7561S  Rev: AH52
  Type:   CD-ROM                           ANSI  SCSI revision: 05
Host: scsi8 Channel: 00 Id: 00 Lun: 00
  Vendor: DGC      Model: LUNZ             Rev: 3103
  Type:   Direct-Access                    ANSI  SCSI revision: 04
[root@pbuovirt3 ~]#