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Description of problem: case: 1) host connected via FC to 500 luns with 4 paths each 2) from storage system (emc), disconnect all storage domains from host 3) run /usr/bin/rescan-scsi-bus.sh 4) run /sbin/multipath 5) run /sbin/multipath -r Jul 19 13:01:54 | 350060160c4604d6f50060160c4604d6f: problem assembing map mp->params too small Jul 19 13:01:54 | 350060160c4604d6f50060160c4604d6f: problem assembing map mp->params too small Jul 19 13:01:55 | 350060160c4604d6f50060160c4604d6f: problem assembing map mp->params too small Jul 19 13:01:56 | 350060160c4604d6f50060160c4604d6f: problem assembing map mp->params too small Jul 19 13:01:57 | 350060160c4604d6f50060160c4604d6f: problem assembing map mp->params too small Jul 19 13:01:58 | 350060160c4604d6f50060160c4604d6f: problem assembing map mp->params too small Jul 19 13:01:59 | 350060160c4604d6f50060160c4604d6f: problem assembing map mp->params too small Jul 19 13:02:00 | 350060160c4604d6f50060160c4604d6f: problem assembing map mp->params too small Jul 19 13:02:01 | 350060160c4604d6f50060160c4604d6f: problem assembing map mp->params too small Jul 19 13:02:01 | 350060160c4604d6f50060160c4604d6f: problem assembing map mp->params too small Jul 19 13:02:02 | 350060160c4604d6f50060160c4604d6f: problem assembing map 1) takes really long time to return 2) would like to understand whats the origin of this error 3) error message has a spell mistake; /s/assembing/assembling/g
There are a number of possible reasons why you might be getting that error. I've made some debug packages that you can pick up at http://people.redhat.com/bmarzins/device-mapper-multipath/rpms/RHEL6/x86_64/ or http://people.redhat.com/bmarzins/device-mapper-multipath/rpms/RHEL6/i686/ that will print more debugging information so that I can see what's going on here.
Since RHEL 6.2 External Beta has begun, and this bug remains unresolved, it has been rejected as it is not proposed as exception or blocker. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux.
*** This bug has been marked as a duplicate of bug 895110 ***