You can reattach a PDL LUN after it has been removed.

Procedure

  1. Return the LUN to working order.
  2. Remove any users of the device.
    You cannot bring a device back without removing active users. The ESXi host cannot know whether the device that was added back has changed. ESXi must be able to treat the device similarly to a new device being discovered.
  3. Perform a rescan to get the device back in working order.