Have you considered taking that drive offline letting the IMS rebuild on a spare? You can then pull that drive and put it in an external enclosure or another machine with SAS card and run full diagnostics on it.
I ran across your thread as I am preparing to put 14 new ST9900805SS drives in an MFSYS25 chassis and was Googling to see if anyone had any negative experiences with this model in the older MFSYS25 units
The simple way is to make the new drive as hot spare first, and then remove the faulty one. But if you don't have any free slot for the new drive, follow the steps below:
1. If the disk is already dead, remove it directly. If it's still accessible, select the drive and click "Force Offline", and then remove it.
2. Insert the new drive.
3. Select the Storage Pool, and then click "Rebuild".
4. Select the new drive to rebuild on.
assuming you have a spare slot available you could just add the drive, define it as a spare (non-revertable !) and then "force offline" the old drive.
Unfortunately you have to run the RAID in insecure mode for several hours. As it is possible that an other sector on an other drive is bad you might end up unrecoverable, maybe even with a completely failed RAID. Intel has no information on these critical situations and how the storage manager will behave.
I have requested two years ago to change that procedure so that one could have a "replace", where all available drives are taken into account when rebuilding the replacement drive. And only after the successful transition the "to-be-replaced-drive" will be shut down. But they decided to stop development of the IMS completely instead and even refined EoL-Date.( This is the worst I have ever seen in IT esp from Intel - now I am having headaches explaining this to my customers)!