CentOS - Jun 2009 - scsi_id doesn't returns any result

Hi all,

  I need to assign persistent names to some scsi disks on one host 
(CentOS 5.3 fully patched), but I can't because scsi_id doesn't returns 
any results. For example:

[root at c5srv01 etc]# scsi_id -u -g -s /block/sda
[root at c5srv01 etc]# scsi_id -u -g -s /block/sdb
[root at c5srv01 etc]# scsi_id -u -g -s /block/sdc
[root at c5srv01 etc]# scsi_id -u -g -s /block/sdd

  Somebody knows what can it be wrong??

Many thanks.
-- 
CL Martinez
carlopmart {at} gmail {d0t} com