Hello ITRich, It shouldn’t have any issue seeing your data.  Here is what you will want to do: 1. Shutdown both the server and the MD1200 2. Disconnect the MD 1200 from the server 3. Power up the server and upgrade to 2008 4. Once upgrade is complete and patched then power down the server and reconnect the MD1200 5. Power up the MD1200 & wait 5 minutes to ensure that the MD is fully up 6. Power on the server and let it post to OS 7. Once in OS check to ensure that the disk are seen 8. Bring disk online and confirm that data is present Let us know if have any other issues.
I plan to upgrade the OS on our R510 from 2003 32bit to 2008 64bit. This R510 has a MD1200 attached running two RAID 10's and a RAID 5 array, storage only. If I shut down, disconnect the MD1200, then reinstall the OS and software on the server, will the MD1200 have any problems connecting back up with OpenManage?   Thanks!
Upgrading OS on a server with an MD1200 attached.