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Note:
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.
Marking a Drive Offline or Missing
If a drive is currently part of a redundant configuration and you want to use it in another
configuration, you can use the MegaRAID Storage Manager commands to remove the drive from
the first configuration and change the drive state to Unconfigured Good.
Caution:
To remove the drive from the configuration without harming the data on the virtual drive, follow
these steps:
1. In the MegaRAID Storage Manager main menu, select Go To->Physical Drive->Make Drive
Offline.
The drive status changes to Offline.
2. Select Go To->Physical Drive->Mark Drive as Missing.
The drive status changes to Unconfigured Good.
Caution:
3. If necessary, create a hot spare drive for the virtual drive from which you have removed the
drive. For information on creating a hot spare drive, see
When a hot spare is available, the controller rebuilds the data on the virtual drive. You can
now use the removed drive for another configuration. If the MegaRAID Storage Manager
software detects that a drive in a virtual drive has failed, it makes the drive offline. If this
happens, you must remove the drive and replace it. You cannot make the drive usable for
another configuration by using the Mark physical disk as missing and Rescan commands.
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Maintaining and Managing Storage Configurations
DB09-000202-05 37857-02
Rev. F - May 2011
A drive rebuild is also started if you select Make Drive Online from the pop-up
menu.
After you perform this procedure, all data on that drive is lost.
After you perform this step, the data on this drive is no longer valid.
Copyright © 2011 by LSI Corporation. All rights reserved.
Creating Hot
Spares.
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