Thursday, October 24, 2013

CELL-04532: Error encountered while creating cell disk on LUN

During the initial Exadata configuration at the step of creating cell disks we obtained the message "CELL-04532: Error encountered while creating cell disk on LUN":

INFO: Running /usr/local/bin/dcli -g /opt/oracle.SupportTools/onecommand/cell_group -l root "cellcli -e create celldisk all " to disks...
ERROR: Ran /usr/local/bin/dcli -g /opt/oracle.SupportTools/onecommand/cell_group -l root "cellcli -e create celldisk all " and it 1 instead of 0 and output is
 

...
ed02celadm01: CellDisk FD_00_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_01_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_02_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_03_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_04_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_05_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_06_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_07_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_08_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_09_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_10_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_11_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_12_ed02celadm01 successfully created
ed02celadm01: CellDisk FD_13_ed02celadm01 successfully created
ed02celadm01:
ed02celadm01: CELL-04532: Error encountered while creating cell disk on LUN: 1_1 4_0 .


As you can see above there were created only 14 flash disks, not 16.
And disks 1_1 and 4_0 weren't created.

We connected to the storage cell and said list lun detail

CellCLI> list lun detail

         name:                   1_0
         cellDisk:               FD_00_ed02celadm01
         deviceName:             /dev/sdv
         diskType:               FlashDisk
         id:                     1_0
         isSystemLun:            FALSE
         lunAutoCreate:          FALSE
         lunSize:                93.13225793838501G
         physicalDrives:         FLASH_1_0
         status:                 normal

         name:                   1_1
         cellDisk:
         deviceName:             /dev/sdw
         diskType:               FlashDisk
         id:                     1_1
         isSystemLun:            FALSE
         lunAutoCreate:          FALSE
         lunSize:                93.13225793838501G
         physicalDrives:         FLASH_1_1
         status:                 normal


As you can see - the LUN 1_1 has status "normal".
4_0 has the normal status too :).
And all good disks have the normal status too.


Then we run the disk reading:

[root@ed02celadm01 ~]# hdparm -tT /dev/sdv

/dev/sdv:
 Timing cached reads:   25848 MB in  2.00 seconds = 12951.07 MB/sec
 Timing buffered disk reads:  630 MB in  3.01 seconds = 209.62 MB/sec
 

[root@ed02celadm01 ~]# hdparm -tT /dev/sdw
/dev/sdw:
 Timing cached reads:   26328 MB in  2.00 seconds = 13192.06 MB/sec
 Timing buffered disk reads:  632 MB in  3.01 seconds = 210.04 MB/sec



As you can see, the bad and good disks are well both.

The "cellcli> CALIBRATE FORCE" showed the no errors too ...


Then we decided to create cell disks manually:

CellCLI> create celldisk FD_14_ed02celadm01 lun=1_1

CELL-04527: Cannot complete the creation of cell disk FD_14_ed02celadm01. Received error: CELL-04521: The LUN 1_1 has a valid celldisk (which is not imported).
Cell disks are not created: FD_14_ed02celadm01

CellCLI> create celldisk FD_14_ed02celadm01 lun=4_0

CELL-04527: Cannot complete the creation of cell disk FD_14_ed02celadm01. Received error: CELL-04521: The LUN 4_0 has a valid celldisk (which is not imported).
Cell disks are not created: FD_14_ed02celadm01


The solution is to run dd on the storage cell and wipe disk header:


dd if=/dev/zero of=/dev/sdw bs=1M count=20


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