Two disks damaged on RAID 5

[Rustom]

Dears,

We have a HP server with physical RAID controller which has two logical drivers, one for system (RAID1) and the other for data (RAID5), in the logical drive with RAID5 two physical disks were damaged at the same time, after replacing the disks:

- All physical drivers are Ok, sample output:

[ ~]$ sudo ssacli ctrl slot=0 pd all show

Smart Array P420i in Slot 0 (Embedded)

Array A

physicaldrive 1I:2:1 (port <SNIPPED>, OK)
physicaldrive 2I:2:5 (port <SNIPPED>, OK)

Array B

physicaldrive 1I:2:2 (port 1I:box 2:bay 2,<SNIPPED>, OK)
physicaldrive 1I:2:3 (port 1I:box 2:bay 3, ,<SNIPPED>, OK)
physicaldrive 1I:2:4 (port 1I:box 2:bay 4, ,<SNIPPED>, OK)
physicaldrive 2I:2:6 (port 2I:box 2:bay 6, ,<SNIPPED>, OK)
physicaldrive 2I:2:7 (port 2I:box 2:bay 7, ,<SNIPPED>, OK)
physicaldrive 2I:2:8 (port 2I:box 2:bay 8, ,<SNIPPED>, OK)

<SNIPPED>

- Logical drive associated with data partition is not ok:

[ ~]$ sudo ssacli ctrl slot=0 ld all show

Smart Array P420i in Slot 0 (Embedded)

Array A

logicaldrive 1 (<SNIPPED>, RAID 1, OK)

Array B

logicaldrive 2 (<SNIPPED>, RAID 5, Failed)

[ ~]$

1- Please would you advise us if there is any option to recover even some of the data on the logical drive Array B (RAID5)?

2- How to recreate the partition (if it's not possible to recover any data)? is the below command right:

ssacli ctrl slot=0 create type=ld drives=1I:2:2-2I:2:8 raid=5

Thank you in advance for your assistance,

Best Regards,

Rustom

[Sebasbin]

Hi,

RAID 5 can only withstand one disk drive failure. If 2 drives failed in the RAID 5 array, the array also fails and its data is not accessible

You need to replace the failed disks and recreate the array and restore the data from the backup.

[Rustom]

Hi Sebasbin,

Thank you for your response,

Actuelly we have replaced the damged disks and all the physical drive are OK.

# ssacli ctrl slot=0 pd all show

Smart Array P420i in Slot 0 (Embedded)
Array A
physicaldrive 1I:2:1 (port <SNIPPED>, OK)
physicaldrive 2I:2:5 (port <SNIPPED>, OK)

Array B
physicaldrive 1I:2:2 (port 1I:box 2:bay 2,<SNIPPED>, OK)
physicaldrive 1I:2:3 (port 1I:box 2:bay 3, ,<SNIPPED>, OK)
physicaldrive 1I:2:4 (port 1I:box 2:bay 4, ,<SNIPPED>, OK)
physicaldrive 2I:2:6 (port 2I:box 2:bay 6, ,<SNIPPED>, OK)
physicaldrive 2I:2:7 (port 2I:box 2:bay 7, ,<SNIPPED>, OK)
physicaldrive 2I:2:8 (port 2I:box 2:bay 8, ,<SNIPPED>, OK)
#

Please confirm me the stpes to recreate the array:

# ssacli ctrl slot=0 ld 2 delete
# ssacli ctrl slot=0 create type=ld drives=1I:2:2-2I:2:8 raid=5

Best Regards,

[Rustom]

Hi,

Please can any one confirm the above steps, and avise if i have missed something.

Best Regards.

[Sebasbin · Accepted solution]

Hi,

I would suggest login to the smart storage administrator to delete and re-create the logical drive

->Reboot the server
->Press F10 During POST
-> Select smart storage administrator
-> Select the smart array controller p420i
-> Click on configure
-> Select the logical drive which you need to delete and then select"delete logical drive"
-> Once deleted the logical drive, you can select the unassigned drives and create the new logical drive

Also, you can perform the steps to recreate the array by using ssacli (below the commands for example)

Delete logical drive (controller slot 0, logical drive 2)

#ssacli ctrl slot=0 ld 2 delete

Create a new RAID 5 logical drive (controller slot 0, diks in port 1I:box 2:bay 2,port 1I:box 2:bay 3,port 1I:box 2:bay 4,port 2I:box 2:bay 6,port 2I:box 2:bay 7,port 2I:box 2:bay

#ssacli ctrl slot=0 create type=ld drives=1I:2:2,1I:2:3,1I:2:4,2I:2:6,2I:2:7,2I:2:8 raid=5