Depending on age of the 1850s and it seems all the 1600s have an issue when Anaconda is trying to detect USB. Do a no usb install on those. Also, on the 1850, if you're using a raid card, you may need to disable the onboard raid as it can be touchy. Otherwise, I have 3000Rs, 1850Rs, DL360Rs (which i won't buy again as these have been the most unreliable) and DL380s, all happily chugging along on ver 3 and ver 4 installs. I did hit some snags with LVM conflicts. I think the proprietary scsi conflicted, but setting up with disk druid has always been reliable.
John Hinton
Let me guess, power supply fan failures on the 360's? If it helps, the newer ones have come a long way.
On topic, I have CentOS on:
DL360G1 DL380G1 and G2 DL580G1 and G2 PL8000 PL8500
No issues on any of them that I can recall.