inside the mind of a linux admin

MegaCLI cheatsheet

Recently I’ve had to do extensive work with Dell PowerEdge servers, and specifically Dell’s that use the LSI MegaRAID controllers. Anyone who has ever had to work with the LSI RAID controllers knows that the MegaCLI provided by LSI is the most cryptic command line utility in existence. MegaCli is available for Linux, DOS, Windows, Netware and Solaris. You can get it from LSI’s website (search for MegaRAID SAS).

Inside the tarball or zip file you’ll find an RPM archive which contains the MegaCli and MegaCli64 binaries (will be installed to /opt/MegaRAID/MegaCli).

Please note:
This emergency cheat sheet is not exhaustive, but it should be sufficient in most cases. For a complete reference either call MegaCli -h or refer to the manual at:

While there are a lot of different parameters for MegaCli, some of them are always identical. These are described here in short.

Adapter parameter -aN
The parameter -aN (where N is a number starting with zero or the string ALL) specifies the PERC5/i adapter ID. If you have only one controller it’s safe to use ALL instead of a specific ID, but you’re encouraged to use the ID for everything that makes changes to your RAID configuration.

Physical drive parameter -PhysDrv [E:S]
For commands that operate on one or more pysical drives, the -PhysDrv [E:S] parameter is used, where E is the enclosure device ID in which the drive resides and S the slot number (starting with zero). You can get the enclosure device ID using “MegaCli -EncInfo -aALL”. The E:S syntax is also used for specifying the physical drives when creating a new RAID virtual drive.

Virtual drive parameter -Lx
The parameter -Lx is used for specifying the virtual drive (where x is a number starting with zero or the string all).

Controller information

MegaCli -AdpAllInfo -aALL
MegaCli -CfgDsply -aALL
MegaCli -AdpEventLog -GetEvents -f events.log -aALL && cat events.log

Enclosure information

MegaCli -EncInfo -aALL

Virtual drive information

MegaCli -LDInfo -Lall -aALL

Physical drive information

MegaCli -PDList -aALL
MegaCli -PDInfo -PhysDrv [E:S] -aALL

Battery backup information

MegaCli -AdpBbuCmd -aALL

Controller management

Silence active alarm

MegaCli -AdpSetProp AlarmSilence -aALL

Disable alarm

MegaCli -AdpSetProp AlarmDsbl -aALL

Enable alarm

MegaCli -AdpSetProp AlarmEnbl -aALL

Physical drive management

Set state to offline

MegaCli -PDOffline -PhysDrv [E:S] -aN

Set state to online

MegaCli -PDOnline -PhysDrv [E:S] -aN

Mark as missing

MegaCli -PDMarkMissing -PhysDrv [E:S] -aN

Prepare for removal

MegaCli -PdPrpRmv -PhysDrv [E:S] -aN

Replace missing drive

MegaCli -PdReplaceMissing -PhysDrv [E:S] -ArrayN -rowN -aN

The number N of the array parameter is the Span Reference you get using “MegaCli -CfgDsply -aALL” and the number N of the row parameter is the Physical Disk in that span or array starting with zero (it’s not the physical disk’s slot!).

Rebuild drive

MegaCli -PDRbld -Start -PhysDrv [E:S] -aN
MegaCli -PDRbld -Stop -PhysDrv [E:S] -aN
MegaCli -PDRbld -ShowProg -PhysDrv [E:S] -aN

Clear drive

MegaCli -PDClear -Start -PhysDrv [E:S] -aN
MegaCli -PDClear -Stop -PhysDrv [E:S] -aN
MegaCli -PDClear -ShowProg -PhysDrv [E:S] -aN

Bad to good (or back to good as I like to call it)

MegaCli -PDMakeGood -PhysDrv[E:S] -aN

This changes drive in state Unconfigured-Bad to Unconfigured-Good.

Walkthrough: Change/replace a drive

Set the drive offline, if it is not already offline due to an error

MegaCli -PDOffline -PhysDrv [E:S] -aN

Mark the drive as missing

MegaCli -PDMarkMissing -PhysDrv [E:S] -aN

Prepare drive for removal

MegaCli -PDPrpRmv -PhysDrv [E:S] -aN

Change/replace the drive

If you’re using hot spares then the replaced drive should become your new hot spare drive:

MegaCli -PDHSP -Set -PhysDrv [E:S] -aN

In case you’re not working with hot spares, you must re-add the new drive to your RAID virtual drive and start the rebuilding

MegaCli -PdReplaceMissing -PhysDrv [E:S] -ArrayN -rowN -aN
MegaCli -PDRbld -Start -PhysDrv [E:S] -aN


  • Laz on Sunday, June 10, 2012

    You are right I’m having a hard time setting the jbod disks spin down when they are not in use. The link with full commands is dead, can you repost a new link?

  • Frank Cabreja on Friday, June 29, 2012

    The row number of a physical drive needed in the command: MegaCli -PdReplaceMissing -PhysDrv [E:S] -ArrayN -rowN -aN can be determined using MegaCli –PdGetMissing -aALL

  • Jason Lucero on Tuesday, January 8, 2013

    I ran into an issue where there was no enclosure and had to use [:S] instead of [E:S]

  • Jesper on Thursday, January 10, 2013

    Very nice cheatsheet, helped me a lot recently when I had to replace a faulty drive.

  • Michael on Tuesday, April 16, 2013

    Thanks! This is great!

  • Steve on Tuesday, June 11, 2013

    Instead of
    MegaCli -AdpEventLog -GetEvents -f events.log -aALL && cat events.log
    how about just using
    MegaCli -AdpEventLog -GetEvents -f /dev/stdout -aALL

  • on Sunday, August 11, 2013

    Great references!!! I found the that the MegaCLI GUI is not working well for us and is flaky. the commands helped us rebuild drive failures on a couple of our hybrid compute/storage arrays. This is part of our standarnd build now and the commands are great to utilize automation. No help from website other than downloads. Thanks for spending the time to put this together!!!

  • xteracrack on Monday, October 21, 2013

    Thanks a lot!!! work for me in Linux, great job this page 🙂

    [root@DBS1 MegaCli]# pwd
    [root@DBS1 MegaCli]# rpm -qa |grep Mega
    [root@DBS1 MegaCli]# cat /etc/redhat-release
    Red Hat Enterprise Linux Server release 6.1 (Santiago)
    [root@DBS1 MegaCli]# uname -a
    Linux DBS1 2.6.32-100.34.1.el6uek.x86_64 #1 SMP Wed May 25 17:46:45 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux
    [root@DBS1 MegaCli]# lspci |grep RAID
    50:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2108 [Liberator] (rev 05)

  • JP-TOK on Tuesday, February 4, 2014

    Hey guys
    what is the command for make the leds on the physical drives to light again , ,cant tell which drive is failing on visual check.

    Any way I can visualize what is my RAID arrangement ?


  • Kuldeep Kulkarni on Monday, May 5, 2014

    Thank you! Really nice 🙂

  • Florido on Monday, June 23, 2014

    Thanks Erik! this saved me a lot of time!

  • sjas on Monday, November 10, 2014

    Blinking LED’s on linux?

    THEORY: (from the manual)
    MegaCli –PDLocate –PhysDrv[E0:S0,E1:S1….]

    will locate drives.

    in short: (a0 for adapter, since i assume you only have 1 raid controller)

    Start blinking:
    MegaCli pdlocate physdrv \[252:0\] a0

    Stop blinking:
    MegaCli pdlocate stop physdrv \[252:0\] a0

    where 252 is the enclosure’s device id, find it out via:

    MegaCli encinfo a0

  • Joshua Hoblitt on Wednesday, November 12, 2014

    Great reference – thank you for putting this together.

  • Kenny on Wednesday, January 7, 2015

    To blink LED:
    MegaCli -PdLocate {[-start] | -stop} -physdrv[E0:S0,E1:S1,…] -aN|-a0,1,2|-aALL

    Meaning: MegaCli -PdLocate -start -physdrv[“Enclosure Device ID”:”Slot Number”] -“Adapter”

    Example: MegaCli -PdLocate -start -physdrv[237:2] -a0
    Example: MegaCli -PdLocate -stop -physdrv[237:2] -a0

    (Will return something like: Adapter: 0: Device at EnclId-252 SlotId-0 — PD Locate Start Command was successfully sent to Firmware)

  • Peter Torkelson on Thursday, February 19, 2015

    I can not even count the number of times I have come back to this page as reference because the official documentation is … well, LSI.

  • JimD on Thursday, June 4, 2015

    There’s another MegaCli cheat sheet here:

    … with some additional, and extremely useful examples. For example to list info about logical drives (and the status of each VD):

    megacli -LDInfo -Lall -aALL

    … and if you pipe the output from that through this command:

    | egrep “^(Virtual|State|Num)” /tmp/mega-l | sed -e ‘N;N;s/\n/ /g’

    … you’ll see a one line summary of each VD, it’s current state, an the number of disks associated with it.

    Another is this:

    ./MegaCLI -CfgLdAdd -r1′ [38:0,38:1]’ -a0

    … set up a RAID-1 using drives 0 and 1 from enclosure 38 on adapter zero and
    this monster:

    ./MegaCli -CfgSpanAdd -r50 -Array0[38:0,38:1,38:2,38:3,38:4,38:5] -Array1[38:6,38:7,38:8,38:9,38:10,38:11] Direct RA WB -a0

    … set up a RAID-50 (volume spanned across two RAID-5 arrays)

    Or this:

    ./MegaCli -AdpSetProp -EnableJBOD 1 -aALL

    … which allegedly works with some MegaRAID adapters (though, perhaps not the ones I’m using in our cloud).

  • JimD on Thursday, June 4, 2015

    Here’s yet another good cheat sheet with even more commands on it:

    … but I’m still looking for a command or script that gives a simple tabular summary of every LD … the corresponding Linux /dev/XX name … and the member PDs (or LD Spans) … and the status of each.

    We want a simple way to identify the failed or failing drives (in a pseudo-JBOD arrangement) … auto-generate tickets to our DCOps staff … and the be able to scan for the “Unconfigured(Good)” state that show up after the replacement … to automate the re-creation of the LD (megacli -CfgLdAdd -r0′[?:XX]’ -a0 — single volume “RAID-0” in our case) and run our initialization script (parted mklabel … mkpart … mkfs.ext4 and mount, etc).

  • Keith Seymour on Monday, November 9, 2015

    Great reference – thank you for putting this together.

  • nasir on Wednesday, November 30, 2016

    Thank you very very much! this was really helpful

  • Megacli | Shadows of epiphany on Tuesday, June 20, 2017

    I am running a Debian server and The Debian Raid Guide was invaluable as was Erik’s cheatsheet

  • Christopher Murtagh on Tuesday, August 11, 2020

    I can’t even count how many times I’ve come back to this page to fix some thing, or just to turn off an alarm from one of my many LSI devices. I should just get it tattooed to my arm. If ever you come to Montreal, I owe you at least a beverage or two.

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