http://thatlinuxbox.com/blog/article.php/lsi-megaraid-megacli

Install MegaCLI:

wget ftp://tsupport:tsupport@ftp0.lsil.com/private/MegaRAID/downloads/8.00.23_Linux_MegaCLI.zip

unzip 8.00.23_Linux_MegaCLI.zip

rpm -Uvh Lib_Utils-1.00-08.noarch.rpm MegaCli-8.00.23-1.i386.rpm

The path to MegaCLI may not be added during installation, so you might just change into the directory containing the binaries and preface commands with “./”:

cd /opt/MegaRAID/MegaCli/

In the following examples, we assume only one controller is installed and use -a0 or -a0.

Silence an alarm:

./MegaCli -AdpSetProp -AlarmSilence -a0

You have to escape the brackets and braces needed by some commands.

To manipulate a particular physical device, address it by enclosure and slot:

Disk info for drive on port 6:

./MegaCli -pdInfo -PhysDrv \[252:6\] -aALL

Display all information about all RAID adapter / settings:

./MegaCli -AdpAllinfo -aALL

Display information about all physical drives:

./MegaCli -PDList -aALL

Display information about all logical / virtual drives:

./MegaCli -LDGetProp -LALL -aALL

Removing a drive and putting it right back onto the same RAID controller will cause the drive to marked as “Foreign”. A drive in the “Foreign” state is not usable in an array.

See the detailed section here: http://thatlinuxbox.com/blog/article.php/lsi-megaraid-megacli

Summary:

Find the drive that is not “Online” which should be the newly replaced drive by showing the first few lines of output for each drive:

./MegaCli -PDList -aALL | grep --before-context=12 Firmware

./MegaCli -PDMakeGood -PhysDrv \[E:S\] -aALL

Drives (arrays) from another controller (in a “Foreign” state) can be imported and used. However, if you just want to reuse a drive, you have to clear the “Foreign” state before you can use it again:

./MegaCli -CfgForeign -Clear -a0

Make this unconfigured drive a hot spare:

./MegaCli -PDHSP -Set -PhysDrv \[E:S\] -a0

Verify RAID rebuild in progress:

./MegaCli -pdrbld -showprog -physdrv\[E:S\] -a0

or display a continuous text-gui rebuild status:

./MegaCli -pdrbld -progdsply -physdrv\[E:S\] -a0

Change the adapter rebuild rate to 60%:

./MegaCli -AdpSetProp \{RebuildRate -60\} -a0

Create a single disk (RAID 0):

./MegaCli -CfgLdAdd -r0 \[252:6\] -a0

Create a two-disk (RAID 1):

./MegaCli -CfgLdAdd -r1 \[252:6,252:7\] -a0

In some circumstances, the OS can’t see the new drive when using fdisk -l. Try forcing a SCSI bus rescan:

echo "- - -" > /sys/class/scsi_host/host0/scan

You may need to find the proper host#:

cat /sys/class/scsi_host/host0/proc_name
cat /sys/class/scsi_host/host1/proc_name
cat /sys/class/scsi_host/host2/proc_name