How to Store Voting Disk Files in ASM for 11g R2 Clusterware High Availability   2 comments

11gR2 clusterware voting disk files can be stored in ASM through the ASM diskgroup.  To ensure the high availability of the clusterware, it is highly recommended to store multiple voting disk files. When storing the voting disk files in ASM, the redundancy setting of the ASM diskgroup determines the number of voting disk files. The following settings  are recommended for planning  the proper configuration of ASM diskgroup that is used to store the voting disk files.

  • External Redundancy: The ASM diskgroup only needs one failure group without mirroring and it only stores one voting disk file. It is recommended that the disk have  external redundancy RAID configuration to provide the storage high availability.  
  • Normal Redundancy:  The ASM diskgroup requires three failure groups and it will provide three voting disks files.
  • High Redundancy: The ASM diskgroup requires five failure groups and it has five voting disk files.

Following the recommended settings above, you can configure the 11g R2 clusterware by storing the voting disk files in ASM:

1.  Based on the external storage redundancy and number of voting disks that you plan  to have , select the appropriate redundancy setting for your ASM diskgroup. If there is no external redundancy for the storage disks or you would like to have additional voting disk files, it is recommended to select normal or high redundancy as the setting of choice for the ASM diskgroup.  As an example , we configure the high redundancy setting for the ASM diskgroup. The ASM diskgroup has five ASM failure groups each of which is on one of the following ASM disks:  ORCL:OCR1,  ORCL: OCR2, ORCL:OCR3,  ORCL: OCR4, ORCL:OCR5

     2.   During 11g R2 Oracle Grid Infrastructure installation,  select “Automatic Storage Management (ASM) In the storage selection step  as shown below:

3. Specify the ASM diskgroup name and select the proper redundancy level and the corresponding ASM disks. As   shown in the example below, select the high redundancy and the five ASM disk: ORCL:OCR1,  ORCL: OCR2, ORCL:OCR3,  ORCL: OCR4, ORCL:OCR5

4. After the Grid Infrastructure installation completes, login to the ASM instance to check the ASM diskgroup redundancy setting and list the voting disk files using the command of ‘crsctl query css votedisk’.

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2 responses to “How to Store Voting Disk Files in ASM for 11g R2 Clusterware High Availability

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  1. Hi! Great post!

    Could you please advice on the following:
    We use multipath storage with its own mirroring configuration.

    We have been forced to create the following DISK groups in ASM:
    DISK1 and DISK2 (250GB) for +DATA disk group.
    No disk groups for FRA (FRA went to +DATA)

    We have 8 disks 1GB in size for OCR

    What we have done was to create disk +DATA (500GB) for data files and FRA redundancy External

    8 Disks OCRL:OCR1-8 for +OCR: redundancy has been set to “Normal”

    Three voting disks have been created.

    Do you think it does make sense ? Or we are wasting two 1GB disks in this configuration?

    Thank in advance for your feedback!

    Kind Regards
    Zama Racha

    • Hi, Zama,

      Sorry for the late response as I have been traveling recently. As we discussed before, you only need three disks for the “Normal” redudnacy diskgroup
      when you use it to store Votingdisk files. Since # of votingdisk files is determined by the redudnacy setting, you only get 3 votingdisk even you put 8 didks on
      the diskgroup. So you waste 5 disks. One solution will be to use the “High” redudancy setting using five disks . Then you will have five votingdisk files. Then you can use the rest three disks to create another ASM diskgroup to store another copy of OCR. Then you have five votingdisks and two COR copies, which will give you better pretection for clusterware.

      thanks
      Kai

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