Hello.
As far as we can see in the ILO, we have 7 disks in the disk bays (slot 1 to slot 7)
marked with failure are disk bays 1, 4 and 6.
If we assume that the RAID scheme was
2 disks of 146GB (type EG0146FAWHU ) in RAID 1
5 disks of 300GB (type EG0300FAWHV ) in RAID 5
The first disk to change would be the 146GB disk which should be in disk bay 1,
The fault LED should be on or blinking (amber), the activity/line LED should be on or off (green).
If both LEDs are blinking, the disk cannot be removed, some process is in progress.
When removing the disk you must wait at least 1 minute for the controller to register this change. Then you must insert the new disk and wait for the rebuilding process to finish, this may take a few hours. At the end, only the activity LED (green) should be active.
In RAID 5 you would have 2 failed disks (this is very serious), from what you can see in the ILO, you would have 4 disks for Data and one disk as Hot spare. So in summary 2 disks failed so the hot spare is being used.
The hot spare is a spare disk that is not being used, and when a disk in the array fails it is automatically activated and comes into use.
The failed disks would be in disk bays 4 and 6.
Proceed as above, but only one change at a time, it is recommended to wait 10 to 15 minutes between changes.
During the rebuilding process the activity (LEDs) of the disks in that array will have more activity than usual.
You can monitor the status of the disks from the ILO, when the changes are finished the status should change.
You will need to order new disks from your hardware vendor, using the spare part number on the front label of each disk.
Check the failed disks in disk bays 1, 4 and 6 directly.
Based on what you see on the ILO they would be
one HP Product ID EG0146FAWHU 146-GB 6G 10K 2.5 SFF SAS disk.
two HP Product ID EG0300FAWHV 300GB 10k 6G 2.5 SFF SAS disks.
All disk work needs a full backup beforehand of the data or take it to an external storage.
The disk replacement is not complicated and is online, but if you are not experienced in this, you should hire an HP service provider.