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When one of the disks failed in Dell MD1000, the hotspare disk will change its role into online mode, and you need to replace  the bad disk with a good one. So a question comes, how can I set the new disk into hotspare mode.

With the help of MegaCli, it’s quite easy, just a single command like this:

# MegaCli -PDHSP -set -PhysDrv[A:B] -aC

A:  it’s Enclosure Number

B: It’s Slot NUmber

C: It’s Array ID

Here is an example:

Find out the issued disk by this command:

# /usr/sbin/MegaCli -PDList -a1|grep "Firmware state: Unconfigured(good)" -B12

Enclosure Number: 1
Slot Number: 255
Device Id: 32
Sequence Number: 1
Media Error Count: 0
Other Error Count: 1
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
Raw Size: 0MB [0x0 Sectors]
Non Coerced Size: 9007199254740480MB [0xfffffffffff00000 Sectors]
Coerced Size: 0MB [0x0 Sectors]
Firmware state: Unconfigured(good)
–

Enclosure Number: 2
Slot Number: 8
Device Id: 33
Sequence Number: 1
Media Error Count: 0
Other Error Count: 0
Predictive Failure Count: 0
Last Predictive Failure Event Seq Number: 0
Raw Size: 381469MB [0x2e90edd0 Sectors]
Non Coerced Size: 380957MB [0x2e80edd0 Sectors]
Coerced Size: 380928MB [0x2e800000 Sectors]
Firmware state: Unconfigured(good)

Here, “Slot Number: 255″ meas the entire disk cube, just simply pass it. so your command is something like this:

# /usr/sbin/MegaCli -PDHSP -set -PhysDrv[2:8] -a1

Set Physical Drive at EnclId-2 SlotId-4 as Hot Spare Success.