Replacing a Failed Physical Disk

A physical disk outage can reduce performance and data redundancy. Therefore, you should replace a failed disk with a new disk as soon as possible.

To replace a disk when it fails:

Determine which disk failed.

CellCLI> LIST PHYSICALDISK WHERE diskType=HardDisk AND status=failed DETAIL

         name:                   28:5
         deviceId:               21
         diskType:               HardDisk
         enclosureDeviceId:      28
         errMediaCount:          0
         errOtherCount:          0
         foreignState:           false
         luns:                   0_5
         makeModel:              "SEAGATE ST360057SSUN600G"
         physicalFirmware:       0705
         physicalInterface:      sas
         physicalSerial:         A01BC2
         physicalSize:           558.9109999993816G
         slotNumber:             5
         status:                 failed

The slot number shows the location of the disk, and the status shows that the disk failed.

Ensure that the blue "OK to Remove" LED on the disk is lit, before you remove the disk.
Replace the physical disk on the storage server and wait three minutes. The physical disk is hot pluggable, and you can replace it with the power on.
Confirm that the disk is online and its status is NORMAL:
```
CellCLI> LIST PHYSICALDISK WHERE name=28:5 ATTRIBUTES status
```
When you replace a physical disk, the RAID controller must acknowledge the replacement disk before you can use it. Acknowledgment is quick.
Verify that the firmware is correct:
```
ALTER CELL VALIDATE CONFIGURATION
```
You can also check the ms-odl.trc file to confirm that the firmware was updated and the logical unit number (LUN) was rebuilt.
Re-create the grid disks and cell disks that existed on the previous disk in that slot. See "About Rebalancing the Data".