The MegaCli64 command has a ridiculous amount of command line switches, and I found the syntax of those command line switches to be very confusing.
What follows are the commands I found useful when trying to physically identify a failed disk and then replace it.
Moritz Mertinkat has also put together a MegaCli64 PDF cheat sheet. In the event the source link ever 404s, a mirror can be found here.
Get Information from All Physical Disks
The -a command line switch specifies the Array ID, in this case All Array IDs.
MegaCli64 -PdList -aAll
Get Virtual Disk Information
The -a command line switch specifies the Array ID, in this case All Array IDs.
MegaCli64 -LDInfo -Lall -aAll
Get the Number of Virtual Drives Configured on Each Adapter
The -a command line switch specifies the Array ID, in this case All Array IDs.
MegaCli64 -LdGetNum -aAll
Get the Number of Array Controllers
MegaCli64 -adpCount
Blink Hard Drive Lights
Start Blinking
The -a command line switch specifies the Array ID, in this case Array ID 0.
MegaCli64 -PdLocate -start -physdrv[<ENCLOSURE>:<DRIVE>] -a0
Stop Blinking
The -a command line switch specifies the Array ID, in this case Array ID 0.
MegaCli64 -PdLocate -stop -physdrv[<ENCLOSURE><DRIVE>] -a0
Set Dedicated Hot Spare
The following physical drive was Unconfigured(good):
Enclosure Device ID: 4
Slot Number: 16
Device Id: 154
Sequence Number: 1
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
Raw Size: 140014MB [0x11177328 Sectors]
Non Coerced Size: 139502MB [0x11077328 Sectors]
Coerced Size: 139392MB [0x11040000 Sectors]
Firmware state: Unconfigured(good)
SAS Address(0): 0x500000e117951c52
SAS Address(1): 0x0
Connected Port Number: 0(path0)
Inquiry Data: FUJITSU MBE2147RC D905D304PB30AAGJ
When looking at all of the physical drives by running MegaCli64 -PdList -aAll, Array #: 0, 1, 2, 3, 4 were missing a hotspare.
The following command added the Unconfigured(good) physical drive above as a dedicated hotspare:
The -a command line switch specifies the Array ID, in this case Array ID 0.
MegaCli64 -PDHSP -Set -Dedicated -Array0,1,2,3,4 -PhysDrv [4:16] -a0
