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1 new drives attached to a megaraid controller – Avago Technologies MegaRAID Fast Path Software User Manual

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Page 404

LSI Corporation Confidential

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July 2011

MegaRAID SAS Software User Guide

Chapter 10: Maintaining and Managing Storage Configurations

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Rebuilding a Drive

Follow these steps to rebuild a drive:

1. Right-click the icon of the failed drive, and select Rebuild.

2. Click Yes when the warning message appears. If the drive is still good, a rebuild will

starts.

You can monitor the progress of the rebuild in the Group Show Progress window by
selecting Manage >> Show Progress. If the drive cannot be rebuilt, an error
message appears. Continue with the next step.

3. Shut down the system, disconnect the power cord, and open the computer case.

4. Replace the failed drive with a new drive of equal capacity.

5. Close the computer case, reconnect the power cord, and restart the computer.

6. Restart the MegaRAID Storage Manager software.

When the new drive spins up, the drive icon changes back to normal status, and the
rebuild process begins automatically. You can monitor the progress of the rebuild in
the Group Show Progress window by selecting Manage >> Show Progress.

If you want to force a drive into Fail status to trigger a rebuild, right-click the drive icon,
and select Make Drive Offline. A red circle appears next to the drive icon. Right-click
the icon, and select Rebuild from the pop-up menu. A drive rebuild cannot be aborted.

NOTE: A drive rebuild is also started if you select Make Drive Online from the pop-up
menu.

10.4.1

New Drives Attached to a

MegaRAID Controller

When you insert a new drive on a MegaRAID system and if the inserted drive does not
contain valid DDF metadata, the drive displays as JBOD for MegaRAID entry-level
controllers, such as the SAS 9240-4i/8i. If the drive does contain valid DDF metadata, its
drive state is Unconfigured Good.

A new drive in JBOD drive state is exposed to the host operating system as a
stand-alone drive. Drives in JBOD drive state are not part of the RAID configuration
because they do not have valid DDF records. The operating system can install and run
anything on JBOD drives.

Automatic rebuilds always occur when the drive slot status changes, for example, when
you insert a drive or remove a drive, so that a hot spare can be used. However, a new
drive in JBOD drive state (without a valid DDF record), does not perform an automatic
rebuild.

To start an automatic rebuild on the new JBOD drive, you have to change the drive
state from JBOD to Unconfigured Good. (Rebuilds start on Unconfigured Good drives
only.) After you set the drive state to Unconfigured Good, the drive state information
always remains on the drive, and you can use the drive for configuration.