Tuesday 25 June 2019

Step By Step Exadata Storage Cell Rescue Process


You will be ended up performing storage cell rescue under the following situations:
  • Improper Battery Replacement
  • Improper Card Seating
  • Card Damage During Battery Replacement
  • Corrupted Root File System

In this article we will demonstrate step by step process to Rescue an Exadata Storage Cell or server.

Open a browser and enter the ILOM hostname or IP address of the Storage cell you want to rescue
https://dm01cel02-ilom.netsoftmate.com

Enter root crendentials

On the left pane under "Remote Control", click "Redirection". Select "Use video redirection" and click "Launch Remote Console" button

Click OK

 Click OK

Click Continue

Click Run

Click Continue (not recommended)

From the ILOM video console we can see that the root file system can't be mounted due to corruption and it will be rebooted again in 60 seconds

On the left pane under "Host Management" click on "Power Control". From the drop down list Select "Power Cycle"

Click Save

Click OK

Rebooting in progress

Server is no rebooting


Immediately press Ctrl+S on keyboard 

Select the "CELL_USB_BOOT_CELLBOOT_usb_in_rescue_mode

At the point, we will have continue the rescue process using serial ILOM

As root, ssh to the storage cell ILOM and start the serial console

Enter r and hit return

Enter y and hit return

Enter the rescue password sos1exadata. Enter n and hit return

Enter the root user password 

We are into the rescue mode. At this moment check to make sure that the there are no file system issue. Fix any other issue you may have. Consult Oracle if required

Reboot the server again to complete the rescue process

Hit return

The server is powered off

Power on the server using web ILOM as shown below

Rescue process is completed and we got the root login prompt


Login to the server as root user and perform the post rescue steps
  
Verify the image version of the storage cell


Post Storage Cell Rescue steps:

[root@dm01cel02 ~]# imageinfo

Kernel version: 4.1.12-94.8.4.el6uek.x86_64 #2 SMP Sat May 5 16:14:51 PDT 2018 x86_64
Cell version: OSS_18.1.7.0.0AUG_LINUX.X64_180821
Cell rpm version: cell-18.1.7.0.0_LINUX.X64_180821-1.x86_64

Active image version: 18.1.7.0.0.180821
Active image kernel version: 4.1.12-94.8.4.el6uek
Active image activated: 2019-03-17 03:27:41 -0500
Active image status: success
Active system partition on device: /dev/md5
Active software partition on device: /dev/md7

Cell boot usb partition: /dev/sdm1
Cell boot usb version: 18.1.7.0.0.180821

Inactive image version: undefined
Rollback to the inactive partitions: Impossible


CellCLI> import celldisk all force
No cell disks qualified for this import operation

CellCLI> list physicaldisk
         12:0            PST0XV          normal
         12:1            PZNDSV          normal
         12:2            PT5Z4V          normal
         12:3            PU3XLV          normal
         12:4            PYAKLV          normal
         12:5            PV828V          normal
         12:6            PZE5NV          normal
         12:7            PYV0YV          normal
         12:8            PZKUXV          normal
         12:9            PYD86V          normal
         12:10           PZL15V          normal
         12:11           PZPLAV          normal
         FLASH_1_1       S2T7NCAHA00958  normal
         FLASH_2_1       S2T7NCAHA00986  normal
         FLASH_4_1       S2T7NCAHA00956  normal
         FLASH_5_1       S2T7NCAHA00947  normal

CellCLI> list celldisk
         CD_00_dm01cel02        normal
         CD_01_dm01cel02        normal
         CD_02_dm01cel02        normal
         CD_03_dm01cel02        normal
         CD_04_dm01cel02        normal
         CD_05_dm01cel02        normal
         CD_06_dm01cel02        normal
         CD_07_dm01cel02        normal
         CD_08_dm01cel02        normal
         CD_09_dm01cel02        normal
         CD_10_dm01cel02        normal
         CD_11_dm01cel02        normal
         FD_00_dm01cel02        normal
         FD_01_dm01cel02        normal
         FD_02_dm01cel02        normal
         FD_03_dm01cel02        normal

CellCLI> list griddisk
         DATA_DM01_CD_00_dm01cel02     active
         DATA_DM01_CD_01_dm01cel02     active
         DATA_DM01_CD_02_dm01cel02     active
         DATA_DM01_CD_03_dm01cel02     active
         DATA_DM01_CD_04_dm01cel02     active
         DATA_DM01_CD_05_dm01cel02     active
         DATA_DM01_CD_06_dm01cel02     active
         DATA_DM01_CD_07_dm01cel02     active
         DATA_DM01_CD_08_dm01cel02     active
         DATA_DM01_CD_09_dm01cel02     active
         DATA_DM01_CD_10_dm01cel02     active
         DATA_DM01_CD_11_dm01cel02     active
         DBFS_DG_CD_02_dm01cel02       active
         DBFS_DG_CD_03_dm01cel02       active
         DBFS_DG_CD_04_dm01cel02       active
         DBFS_DG_CD_05_dm01cel02       active
         DBFS_DG_CD_06_dm01cel02       active
         DBFS_DG_CD_07_dm01cel02       active
         DBFS_DG_CD_08_dm01cel02       active
         DBFS_DG_CD_09_dm01cel02       active
         DBFS_DG_CD_10_dm01cel02       active
         DBFS_DG_CD_11_dm01cel02       active
         RECO_DM01_CD_00_dm01cel02     active
         RECO_DM01_CD_01_dm01cel02     active
         RECO_DM01_CD_02_dm01cel02     active
         RECO_DM01_CD_03_dm01cel02     active
         RECO_DM01_CD_04_dm01cel02     active
         RECO_DM01_CD_05_dm01cel02     active
         RECO_DM01_CD_06_dm01cel02     active
         RECO_DM01_CD_07_dm01cel02     active
         RECO_DM01_CD_08_dm01cel02     active
         RECO_DM01_CD_09_dm01cel02     active
         RECO_DM01_CD_10_dm01cel02     active
         RECO_DM01_CD_11_dm01cel02     active


[root@dm01cel02 ~]# cellcli -e list flashcache detail
         name:                   dm01cel02_FLASHCACHE
         cellDisk:               FD_03_dm01cel02,FD_01_dm01cel02,FD_02_dm01cel02,FD_00_dm01cel02
         creationTime:           2019-03-17T03:19:43-05:00
         degradedCelldisks:
         effectiveCacheSize:     11.64312744140625T
         id:                     574c3bd1-7a35-42ba-a03b-75f3a93edac7
         size:                   11.64312744140625T
         status:                 normal

[root@dm01cel02 ~]# cellcli -e list flashlog detail
         name:                   dm01cel02_FLASHLOG
         cellDisk:               FD_03_dm01cel02,FD_00_dm01cel02,FD_01_dm01cel02,FD_02_dm01cel02
         creationTime:           2019-03-17T03:19:43-05:00
         degradedCelldisks:
         effectiveSize:          512M
         efficiency:             100.0
         id:                     73cd8288-c6d8-42c3-95a1-97ce287cf7d0
         size:                   512M
         status:                 normal

SQL> select a.name,b.path,b.state,b.mode_status,b.failgroup
    from v$asm_diskgroup a, v$asm_disk b
    where a.group_number=b.group_number
    and b.failgroup='dm01cel02'
    order by 2,1;

no rows selected


SQL> alter diskgroup DBFS_DG add disk 'o/192.168.1.1;192.168.1.2/DBFS_DG_*_dm01cel02' force;

Diskgroup altered.

 
SQL> alter diskgroup DATA_DM01 add disk 'o/192.168.1.1;192.168.1.2/DATA_DM01_*_dm01cel02' force;

Diskgroup altered.

 
SQL> alter diskgroup RECO_DM01 add disk 'o/192.168.1.1;192.168.1.2/RECO_DM01_*_dm01cel02' force;

Diskgroup altered.

 
SQL> select * from v$asm_operation;

GROUP_NUMBER OPERA STAT      POWER     ACTUAL      SOFAR   EST_WORK   EST_RATE EST_MINUTES ERROR_CODE
------------ ----- ---- ---------- ---------- ---------- ---------- ---------- ----------- --------------------------------------------
           1 REBAL RUN           4          4     204367    3521267      13041         254
           3 REBAL WAIT          4


 
SQL> select * from v$asm_operation;

no rows selected


SQL> col path for a70
SQL> set lines 200
SQL> set pages 200
SQL> select a.name,b.path,b.state,b.mode_status,b.failgroup
    from v$asm_diskgroup a, v$asm_disk b
    where a.group_number=b.group_number
    and b.failgroup='dm01cel02'
    order by 2,1;  2    3    4    5

NAME                           PATH                                                                   STATE    MODE_ST FAILGROUP
------------------------------ ---------------------------------------------------------------------- -------- ------- ------------------------------
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_00_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_01_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_02_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_03_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_04_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_05_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_06_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_07_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_08_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_09_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_10_dm01cel02              NORMAL   ONLINE  dm01cel02
DATA_DM01                     o/192.168.1.1;192.168.1.2/DATA_DM01_CD_11_dm01cel02              NORMAL   ONLINE  dm01cel02
DBFS_DG                        o/192.168.1.1;192.168.1.2/DBFS_DG_CD_02_dm01cel02                 NORMAL   ONLINE  dm01cel02
DBFS_DG                        o/192.168.1.1;192.168.1.2/DBFS_DG_CD_03_dm01cel02                 NORMAL   ONLINE  dm01cel02
DBFS_DG                        o/192.168.1.1;192.168.1.2/DBFS_DG_CD_04_dm01cel02                 NORMAL   ONLINE  dm01cel02
DBFS_DG                        o/192.168.1.1;192.168.1.2/DBFS_DG_CD_05_dm01cel02                 NORMAL   ONLINE  dm01cel02
DBFS_DG                        o/192.168.1.1;192.168.1.2/DBFS_DG_CD_06_dm01cel02                 NORMAL   ONLINE  dm01cel02
DBFS_DG                        o/192.168.1.1;192.168.1.2/DBFS_DG_CD_07_dm01cel02                 NORMAL   ONLINE  dm01cel02
DBFS_DG                        o/192.168.1.1;192.168.1.2/DBFS_DG_CD_08_dm01cel02                 NORMAL   ONLINE  dm01cel02
DBFS_DG                        o/192.168.1.1;192.168.1.2/DBFS_DG_CD_09_dm01cel02                 NORMAL   ONLINE  dm01cel02
DBFS_DG                        o/192.168.1.1;192.168.1.2/DBFS_DG_CD_10_dm01cel02                 NORMAL   ONLINE  dm01cel02
DBFS_DG                        o/192.168.1.1;192.168.1.2/DBFS_DG_CD_11_dm01cel02                 NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_00_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_01_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_02_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_03_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_04_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_05_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_06_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_07_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_08_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_09_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_10_dm01cel02              NORMAL   ONLINE  dm01cel02
RECO_DM01                     o/192.168.1.1;192.168.1.2/RECO_DM01_CD_11_dm01cel02              NORMAL   ONLINE  dm01cel02

34 rows selected.
 

Conclusion

In this article we have demonstrated step by step procedure to perform Storage Cell Rescue. You may have to perform the Storage cell rescue for multiple reasons such as root file system corrupted, Kernel panic, server rebooting continuously and so on. With the help of CELLBOOT usb one can perform the storage cell rescue very easily.
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