Yes, this means you have to power of the server and take it apprt. The hardware manual is here Page 80 describes removing a disk. The disks slide out of the cage to the side, the sata/sas cables are numbered. Once the disk is replaced you would set it as a hot spare in openmanage.
I have a Poweredge T300 with 3 physical disks.  In openmanage, the virtual disk is degraded and only shows 2 physical disks, so I guess the third is dud.  I need to know which one to replace.  When I click available tasks on either of the remaining physical disks, no tasks are shown, so I can't use blink and unblink.  Help please!
Which disk do I replace?