Replace a disk drive with the Linux system or logical partition powered on

You might need to replace a Small Computer System Interface (SCSI) disk drive in a system or expansion unit while the Linux® operating system or logical partition that controls the disk drive location is powered on. Use the procedure in this section to perform this task.

Attention: Read these instructions carefully and understand the complexity of the powered-on procedure before you begin. If the system or logical partition that controls the disk drive you are replacing is at the Linux command line, you can use this powered-on procedure.

Go to Replace a disk drive with the system or logical partition powered off, if:

You are installing a disk drive in a 5791, 5794, or 7040-61D expansion unit
You are installing a disk drive that will be connected with the 6203 or 6204 SCSI adapter
You do not feel comfortable using the powered-on procedure

Note: Some of the figures in these procedures might not look exactly like the system or expansion unit that you have. However, the steps to perform the task are the same.

Prepare the system

Perform prerequisite tasks as described in Before you begin.
Is the disk drive you are replacing in a redundant array of independent disk (RAID) 0 array or is the disk drive you are replacing in a failed RAID level 5 or 10 array?
- If yes, you must delete the disk array before replacing the disk. For instructions, see PCI-X SCSI RAID Controller Reference Guide for Linux.
  This guide is available from the SCSI PCI Adapters Web page at http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.pseries.doc/hardware_docs/scsipciadapters.htm.
- If no, your drive is configured as Just a Bunch of Disks (JBOD) or is configured within a degraded array. Proceed to the next step.
If the disk drive you are replacing is in a redundant array of independent disk (RAID) Level 0 disk array or in a failed RAID Level 5 or RAID Level 10 disk array, you must delete the disk array before replacing the disk. For instructions, see the PCI-X SCSI RAID Controller Reference Guide for Linux.
This guide is available from the SCSI PCI Adapters Web page at http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.pseries.doc/hardware_docs/scsipciadapters.htm.
Remove the system unit door or expansion unit door or open the rack front door. For instructions, select the appropriate procedure from the following list:
- Remove the door from the model 285, 52x, 55x, or OpenPower 720
- Expansion unit cover or door
Remove the front cover. For instructions on removing the cover, select the appropriate procedure from the following list:
- Remove the front cover from the model 285, 52x, 55x, OpenPower 720, or the 0595 expansion unit
- Remove the front cover from the model 9116-561 or 570
- Remove the front cover from the model 51x or 710
- Remove the front cover from the 7311-D20 expansion unit
- If you have a front cover from any other models, remove the front cover.

To replace a disk drive in a location with the Linux system or logical partition that controls the disk drive location powered on, select the appropriate procedure from the following list: