You can run omreport storagecommands to view this information and write it to a file. Documenatation for this command can be found in the Server Administrator CLI user's guide, 

Thanks for your response, Carrie!

The omreport storage arraydisks command brought back the manufacturer drive ID, just like my WMI script did. Sadly, there is no information about drive temperature or rpm in Openmanage, though.

I guess I now understand why, though. There is nothing in the SCSI commands manual about rpms. They do have a temperature page in the log sense command, but maybe not all drive manufacturers support that one.

I now have a way to verify hard drive size/rpm, if a bit inelegant.

Thanks again!
Regards,
nos