Fred,
I have also noticed these errors in our HP environment as well. In regards to the sense data error, it appears that they may be due to a device (CD/DVD) that does not support rescan. Check out this KB, which says the messages are normal and can be ignored. Additionally, when researching this issue I also found this ESXi SCSI Sense Code Decoder that may be helpful. In regards to the failed hp-ilo file open, I have yet to find the cause of a possible lock.
