You're using cheap SATA disks on an HP Smart Array P400 controller. Which firmware version is the controller running? What version of hpacucli are you running?
Please also include the full output of hpacucli ctrl all show config detail.
This can happen in some cases. It's not a big deal:
=> ctrl all show config
Smart Array P410i in Slot 0 (Embedded) (sn: 50014380054E9DA0)
array A (SAS, Unused Space: 1188170 MB)
logicaldrive 1 (72.0 GB, RAID 1+0, OK)
logicaldrive 2 (400.0 GB, RAID 1+0, OK)
logicaldrive 3 (517.6 GB, RAID 5, OK)
physicaldrive 0:0 (box 0:bay 0, SAS, 750 GB, OK)
physicaldrive 0:0 (box 0:bay 0, SAS, 750 GB, OK)
physicaldrive 0:0 (box 0:bay 0, SAS, 750 GB, OK)
physicaldrive 0:0 (box 0:bay 0, SAS, 750 GB, OK)
Yet...
Mirror Group 0:
physicaldrive 0:0 (box 0:bay 0, SAS, 750 GB, OK)
physicaldrive 0:0 (box 0:bay 0, SAS, 1 TB, OK)
Mirror Group 1:
physicaldrive 0:0 (box 0:bay 0, SAS, 750 GB, OK)
physicaldrive 0:0 (box 0:bay 0, SAS, 1 TB, OK)
However, I've had drives in this array fail and all has been well. The drive indicator and email alert worked as usual. Anyway, you should not need to take any action in hpacucli if a drive fails. And you definitely shouldn't use the delete command :)
Edit:
I don't know what OS you're using - it looks like a Linux of some sort... but the right Smart Array P400 firmware can either be be applied using the bootable HP Firmware Update DVD or directly from the operating system using the Linux firmware available here.
Don't worry about the HP Insight Diagnostics in this case... You're clearly using non-HP disks in the server. While the disks would function fine, don't expect HP's specific diagnostics tool to check the devices cleanly.
Why are you running diagnostics if you don't suspect a problem?
Boot into your real OS and make sure you install the HP Management drivers for the system. That is the proper way to monitor your drives while in service.
You can install the hpacucli utility in order to check the status of the RAID volumes and disks.
Best Answer
They're probably just fine but you won't ever really know because HP controllers are configured to work with HP-specific firmware, by not using HP disks you lose out on this function.