Just a little something a bud and myself experienced with the cryptic MegaRAID cli commands and if you happen to hate the MegaRAID WebBios like most people do and that would include myself.

-aX or All, where X is the adapter number 0 or 1, etc

-PhysDrv [E:S] refers to the particular physical disk, where E is the enclosure ID and S is the slot number of the physical disk

To find out what is the enclosure ID, refer to the enclosure info output

e.g.

 In case there is a single LSI MegaRAID adapter, if the enclosure ID is 252 and the disk that is supposed to be replaced is Slot 5 (in actual fact it is Slot 6, the slot number starts from 0). So the format of the [E:S] is [252:5].

- To view adapter info, this will tell you how many LSI MegaRAID adapters are there installed

MegaCli64 -AdpAllInfo -aAll

- To view the enclosure info

MegaCli -EncInfo -aALL

- To view the list of all virtual disks that is connected to the LSI MegaRAID adapters

MegaCli64 -LDInfo -Lall -aALL

- To view the list of all physical disks that is connected to the LSI MegaRAID adapters

MegaCli64 -PDList -aALL

- To view the information of a particular physical disk

MegaCli64 -PDInfo -PhysDrv [E:S] -aALL

- To set the state of a particular disk to offline

MegaCli64 -PDOffline -PhysDrv [E:S] -aX

- To set the state of a particular disk to online

MegaCli64 -PDOnline -PhysDrv [E:S] -aX

- To mark a physical disk as missing, used specifically for disk replacement

MegaCli64 -PDMarkMissing -PhysDrv [E:S] -aX

- To prepare a physical for removal

MegaCli64 -PDPrpRmv -PhysDrv [E:S] -aX

- To replace a missing drive

MegaCli64 -PDReplaceMissing -PhysDrv [E:S] -ArrayM -rowN -aX

- To rebuild a drive

MegaCli64 -PDRbld -Start -PhysDrv [E:S] -aX

MegaCli64 -PDRbld -Stop -PhysDrv [E:S] -aX

MegaCli64 -PDRbld -ShowProg - PhysDrv [E:S] -aX

- To change the status of particular disk from bad to good, or from Unconfigured-Bad to Unconfigured-Good, this is especially useful when a disk has been removed abruptly without properly removing the disk from a particular virtual drive by abruptly pluggin the disk out of it's slot

MegaCli64 -PDMakeGood -PhysDrv [E:S] -aX

To change/replace a drive that is a part of a mirror logical disk

- In the case of the disk replacement we did in RHB, the faulty disk is on slot 5 (6th slot) on enclosure with the ID of 252 on adapter 0

1. Set the drive offline, if it is already not offline

MegaCli64 -PDOffline -PhysDrv [252:5] -a0

2. Mark the drive as missing

MegaCli64 -PDMarkMissing -PhysDrv [252:5] -a0

3. Prepare drive for removal

MegaCli64 -PDPrpRmv -PhysDrv [252:5] -a0

4. Physically remove the disk from the slot, and plug in the new disk

5. Add the new disk back to the affected virtual drive and start rebuilding.

MegaCli64 -PDReplaceMissing -PhysDrv [252:5] -Array2 -row1 -a0

MegaCli64 -PDRbld -Start -PhysDrv [252:5] -a0

6. To view the progress of the rebuild

MegaCli64 -PDRbld -ShowProg -PhysDrv [252:5] -a0

A note on step 4, how do you find out which Array number was affected by the bad disk, we can get find this out by viewing the status of all the logical disk configured on the HBA card (by running MegaCli64 -LDInfo -Lall -aALL) the status of the logical drive should have been marked as degraded.

Another note on step 4, how do you want to now which row the disk is logically at (this row number does not correspond to the slot number). You can find this out by running (MegaCli –PdGetMissing -a0, hopefully you won't have more that one disk missing/removed manually by your goodself)

To replace a drive that is the designated hotspare on a RAID-5 logical disk, well maybe next time.