Unable to save vmcore to SAN devices connected through Qlogic or Emulex HBAs.

Issue

• We have installed RHEL 4 and have configured diskdump to save a vmcore on SAN devices connected through Qlogic FC HBAs, but the diskdump is unable to save vmcore.

• If the diskdump service is started manually then it fails with following error:

  $ service diskdump restart
  diskdump: diskdumpctl: failed to add /dev/sdb1!
  diskdump: activating failed
  kernel: disk_dump: shut down
  

• The same error messages are observed while trying to save vmcore on SAN devices connected through Emulex FC HBAs.