LSI MegaCLI — Check For Failed Raid Controller Battery

701590_rusty_batteryThere are several tools that you can use to monitor and configure and LSI SAS controller, however as I have found, some are easier than others to use and some do not always display the correct information.

In my case my controller is a SAS 9260-8i, and when building a server I always make sure that I install the MegaRaid Storage Manager gui for configuring disks and setting up email alerts. However I have often found that this tool is sometimes confusing to use for other tasks so I also make sure that I install the MegaCLI (command line interface). Both utilities can be downloaded directly from LSI here.

MegaRaid Storage Manager installs to /usr/local/MegaRAID Storage Manager, while the cli installs via rpm to /opt/MegaRAID/MegaCli.

Anyway to check the battery status run the following (note i am running 64 bit os)

#>./MegaCli64 -AdpBbuCmd -aAll

Your output will be lengthy – but look for the line below to know if you need to replace your BBU.

Battery Replacement required            : Yes

Two additional usefully commands are:

  • megacli -AdpAllInfo -aALL lists all the adapters in the machine
  • megacli -PDList -aALL lists all disks and enclosures

Note that there is an open source CLI called Megactl, and while its quick and easy to use to see a quick list of your disks and their statuses, its not shown itself to be accurate when it comes to detecting whether or not a battery has failed. You can get it here

Additonal Megacli command can be found here;

MegaRaid Cards Via CLI


MegaRAID® is LSI’s line of SATA/SAS Storage Controller.


MegaCLI is the Linux console based management utility for LSI SAS controllers. Honestly its a pretty crummy command when compared to HP’s command line tool, but that’s often what you are stuck with when you buy Dell or Supermicro.

Note that I am running the 64 bit version of MegaCLI which is installed in /opt/MegaRAID/MegaCli and is called MegaCli64. On 32 bit systems its called MegaCLI.

The command below will dump out a bunch of info, but if you look for the section labeled “Device Present” you can see failed/degrated drives. In this case I have one failed drive out of 4 total drives

./MegaCli64 -AdpAllInfo -aALL

 Device Present
Virtual Drives    : 2
  Degraded        : 1
  Offline         : 0
Physical Devices  : 4
  Disks           : 3
  Critical Disks  : 0
  Failed Disks    : 0

For more specific disk information run the following command.

./MegaCli64 -LDPDInfo -aAll

Using the command above I can see more information on the drive with the failed submirror

Virtual Disk: 1 (Target Id: 1)
RAID Level: Primary-1, Secondary-0, RAID Level Qualifier-0
Size:59.125 GB
State: Degraded
Stripe Size: 64 KB
Number Of Drives:2


According to Sourceforce, Megactl is.. “is a small collection of programs for examining configuration and status of LSI megaraid adapters, especially Dell PERC RAID adapters, and attached storage devices.”  Get it here.

In my this case I am running medasasctl which makes it a bit easier to see the failed drive.  In the example below I can see two virtual disks (both raid1), but only 3 physical, which indicates that one of my submirrors has failed.

megactl-0.4.1]# ./megasasctl
a0       LSI MegaRAID SAS 9260-8i encl:1 ldrv:2  batt:FAULT, unknown charge state
a0d0       29GiB RAID 1   1×2  optimal
a0d1       59GiB RAID 1   1×2  DEGRADED
a0e252s0    29GiB  a0d0  online 
a0e252s1    29GiB  a0d0  online 
a0e252s2    59GiB  a0d1  online