How to fix LSI MegaRaid RAID5 after 1 disk failed

Question

My LSI MegaRaid just told me one disk is "UBad" which I assume means it failed:

EID:Slt DID State DG     Size Intf Med SED PI SeSz Model                Sp Type 
--------------------------------------------------------------------------------
252:7    13 UBad   F 2.728 TB SATA HDD N   N  512B WDC WD30EFRX-68EUZN0 U  -

I have a hot spare installed:

EID:Slt DID State DG     Size Intf Med SED PI SeSz Model                Sp Type 
--------------------------------------------------------------------------------
252:6    14 DHS    0 2.728 TB SATA HDD N   N  512B WDC WD30EFRX-68EUZN0 D -

but the status of the hot spare didn't change. Is it being used to save my RAID array?

If not, how do I tell the controller to add the hot spare to the disk group 0?

Isn't "ubad" = Unconfigured Bad? Is it possible the bad drive was never added to the array? How many drives in the array? — SqlACID, Dec 27 '16 at 00:38
I think you have a point. I have 6 drives. 4 of them are in the RAID5 array. Each disk is 3TB and the RAID array is 9TB. For some reason, I may have two hot spares :-) How do get the UBad -> DHS? Or how do I add it to the RAID5 array? — Aaron Digulla, Dec 27 '16 at 09:24
i would pull out the ubad drive and try reseating it, if still bad you'll need to replace it. — SqlACID, Dec 27 '16 at 23:28
For other people finding this question: It might be that you had two hot spares and one of them was used to replace a failed drive that was then marked as `UBad`. I just had a RAID1 array where one drive was showing as `Failed`. I added another drive as a hot spare and immediately the `Failed` drive changed to `UBad`, while the hot spare showed as `Rbld`. — Wodin, Jun 26 '20 at 08:12

Aaron Digulla · Answer 1 · 2016-12-29T11:29:42.140

First, get some information about your controller, volumes and drive:

storcli /c0 show all

/c0 is the controller to check. If unsure, try /cALL and look for a line like Controller = to get the controller numbers.

We need EID and Slot/Slt from the output. The TOPOLOGY or PD LIST are good:

TOPOLOGY :
========

---------------------------------------------------------------------------
DG Arr Row EID:Slot DID Type  State BT     Size PDC  PI SED DS3  FSpace TR 
---------------------------------------------------------------------------
 0 -   -   -        -   RAID5 Optl  Y  8.185 TB dflt N  N   none N      N  
 0 0   -   -        -   RAID5 Optl  Y  8.185 TB dflt N  N   none N      N  
 0 0   0   252:0    10  DRIVE Onln  N  2.728 TB dflt N  N   none -      N  
 0 0   1   252:1    9   DRIVE Onln  N  2.728 TB dflt N  N   none -      N  
 0 0   2   252:2    11  DRIVE Onln  N  2.728 TB dflt N  N   none -      N  
 0 0   3   252:3    8   DRIVE Onln  N  2.728 TB dflt N  N   none -      N  
 0 -   -   252:7    13  DRIVE DHS   -  2.728 TB -    -  -   -    -      N  
 0 -   -   252:6    14  DRIVE DHS   -  2.728 TB -    -  -   -    -      N  
---------------------------------------------------------------------------
...
PD LIST :
=======
--------------------------------------------------------------------------------
EID:Slt DID State DG     Size Intf Med SED PI SeSz Model                Sp Type 
--------------------------------------------------------------------------------
252:0    10 Onln   0 2.728 TB SATA HDD N   N  512B WDC WD30EFRX-68AX9N0 U  -    
252:1     9 Onln   0 2.728 TB SATA HDD N   N  512B WDC WD30EFRX-68AX9N0 U  -    
252:2    11 Onln   0 2.728 TB SATA HDD N   N  512B WDC WD30EFRX-68EUZN0 U  -    
252:3     8 Onln   0 2.728 TB SATA HDD N   N  512B WDC WD30EFRX-68EUZN0 U  -    
252:4    12 Onln   - 2.728 TB SATA HDD N   N  512B WDC WD30EFRX-68EUZN0 U  -    
252:6    14 DHS    0 2.728 TB SATA HDD N   N  512B WDC WD30EFRX-68EUZN0 U  -    
252:7    13 DHS    0 2.728 TB SATA HDD N   N  512B WDC WD30EFRX-68EUZN0 U  -    
--------------------------------------------------------------------------------

In order to make the controller to reconsider the drive, set it to good:

storcli /c0 /e252 /s14 set good

/e252 is the enclosure (EID in the output) and /s14 is the slot (Slt in the output).

The state of the disk should now be uGood:

EID:Slt DID State DG     Size Intf Med SED PI SeSz Model                Sp Type 
--------------------------------------------------------------------------------
252:7    13 uGood  F 2.728 TB SATA HDD N   N  512B WDC WD30EFRX-68EUZN0 U  -

If the controller already knew the disk (it was installed before but for some reason, the controller thought the disk was bad), it may show up as DHS (dedicated hot spare).

To check that the disk is OK, run a self test:

smartctl -d megaraid,14  /dev/sdb -t long

14 is the DID (Disk ID) from the PD LIST (storcli /c0 show all). That's the disk that you want. /dev/sdb is the Linux device which is attached to the megaraid driver. -t long starts a long self test.

To find the Linux device, use lsscsi:

 [6:2:0:0]    disk    LSI      MR9260-8i        2.13  /dev/sdb

To check the state of the self test, use smartctl -d megaraid,14 /dev/sdb -c or smartctl -d megaraid,14 /dev/sdb -a

How to fix LSI MegaRaid RAID5 after 1 disk failed

1 Answers1