iscsiadm in RHEL6 supports the -o update option like what was being requested in the original bugzilla. However, we later determined we wanted that support plus the ability to not have to modify the iscsid.conf file with the chap settings to do the initial discovery. This is bz is for that second part to be added to RHEL 6.0 so it matches RHEL 5.

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

This is fixed in iscsi-initiator-utils-6.2.0.872-6. You can download it here:
http://people.redhat.com/mchristi/iscsi/rhel6.0/iscsi-initiator-utils/

One change since the last drop was the discovery2 mode was renamed to discoverydb mode. This drop should fix the return value bug also.

Verified test case from mchristi on RHEL6.0-20100811.2

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.