Issue

• system hangs on boot while discovering SAN disks
• system hangs on boot if multipath disks are in Not Ready state

• multipath errors being continually reported on console:

  device-mapper: create ioctl failed: Device or resource busy
  device-mapper: create ioctl failed: Device or resource busy
  device-mapper: create ioctl failed: Device or resource busy
  device-mapper: create ioctl failed: Device or resource busy
  device-mapper: create ioctl failed: Device or resource busy
  device-mapper: create ioctl failed: Device or resource busy
  

• system hangs on boot if some attached SAN EMC SRDF configured R2 disks are in "suspended state"

• suspended state is same as NR or "Not Ready" state of BCV configurations
• system attached to R1 disks boots/behaves normally

• system log ends at or shortly after "Setting hostname" from rc.sysinit script:

                       Welcome to Red Hat Enterprise Linux Server
                  Press 'I' to enter interactive startup.
  Setting clock  (utc): Wed Dec  2 16:38:12 EST 2009         [  OK  ]
  Starting udev:                                             [  OK  ]
  Starting udev:                                             [  OK  ]
  Loading default keymap (us):                               [  OK  ]
  Setting hostname host1:                                    [  OK  ]
  <system hangs>