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It seems that several people have been having problems getting Dell OMSA 6.2 to work correctly on CentOS 5.4 x86_64. Specifically, the software does not detect any storage controllers, and therefore also doesn't find any disks. eg.

[root@b034 ~]# omreport storage pdisk controller=0
Invalid controller value. Read, controller=0
No controllers found.

After a little investigation, I found the source of the problem.

It turns out that the i386 package of compat-libstdc++-33 is required, although it's not pulled in as a dependency by the srvadmin-whatever RPM.

yum install compat-libstdc++-33.i386
service dataeng restart

Now, the same command works just fine:

[root@b034 ~]# omreport storage pdisk controller=0
List of Physical Disks on Controller PERC 6/i Adapter (Slot 1)

Controller PERC 6/i Adapter (Slot 1)
ID                        : 0:0:0
Status                    : Ok
Name                      : Physical Disk 0:0:0
etc.