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
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
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.
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