2.3.3.4 Increase the Size of the Grid Disks Using Available Space

You can increase the size used by the grid disks if there is unallocated disk space either already available, or made available by shrinking the space used by a different Oracle ASM disk group.

This task is a continuation of an example where space in the RECOC1 disk group is being reallocated to the DATAC1 disk group. If you already have sufficient space to expand an existing disk group, then you do not need to reallocate space from a different disk group.

1. Check that the cell disks have the expected amount of free space.
   After completing the tasks to shrink the Oracle ASM disks and the grid disks, you would expect to see the following free space on the cell disks:

   [root@exa01adm01 tmp]# dcli -g ~/cell_group -l root "cellcli -e list celldisk \
   attributes name,freespace"
   
   exa01celadm01: CD_00_exa01celadm01 276.0625G
   exa01celadm01: CD_01_exa01celadm01 276.0625G
   exa01celadm01: CD_02_exa01celadm01 276.0625G
   exa01celadm01: CD_03_exa01celadm01 276.0625G
   exa01celadm01: CD_04_exa01celadm01 276.0625G
   exa01celadm01: CD_05_exa01celadm01 276.0625G
   exa01celadm01: CD_06_exa01celadm01 276.0625G
   exa01celadm01: CD_07_exa01celadm01 276.0625G
   exa01celadm01: CD_08_exa01celadm01 276.0625G
   exa01celadm01: CD_09_exa01celadm01 276.0625G
   exa01celadm01: CD_10_exa01celadm01 276.0625G
   exa01celadm01: CD_11_exa01celadm01 276.0625G 
   ...

2. For each storage cell, increase the size of the DATA grid disks to the desired new size.

   Use the size calculated in Determine the Amount of Available Space.

   dcli -c exa01celadm01 -l root "cellcli -e alter griddisk DATAC1_CD_00_exa01celadm01 \
   ,DATAC1_CD_01_exa01celadm01 \
   ,DATAC1_CD_02_exa01celadm01 \
   ,DATAC1_CD_03_exa01celadm01 \
   ,DATAC1_CD_04_exa01celadm01 \
   ,DATAC1_CD_05_exa01celadm01 \
   ,DATAC1_CD_06_exa01celadm01 \
   ,DATAC1_CD_07_exa01celadm01 \
   ,DATAC1_CD_08_exa01celadm01 \
   ,DATAC1_CD_09_exa01celadm01 \
   ,DATAC1_CD_10_exa01celadm01 \
   ,DATAC1_CD_11_exa01celadm01 \
   size=692288M "
   ...
   dcli -c exa01celadm14 -l root "cellcli -e alter griddisk DATAC1_CD_00_exa01celadm14 \
   ,DATAC1_CD_01_exa01celadm14 \
   ,DATAC1_CD_02_exa01celadm14 \
   ,DATAC1_CD_03_exa01celadm14 \
   ,DATAC1_CD_04_exa01celadm14 \
   ,DATAC1_CD_05_exa01celadm14 \
   ,DATAC1_CD_06_exa01celadm14 \
   ,DATAC1_CD_07_exa01celadm14 \
   ,DATAC1_CD_08_exa01celadm14 \
   ,DATAC1_CD_09_exa01celadm14 \
   ,DATAC1_CD_10_exa01celadm14 \
   ,DATAC1_CD_11_exa01celadm14 \
   size=692288M "

3. Verify the new size of the grid disks associated with the DATAC1 disk group using the following command:

   dcli -g cell_group -l root "cellcli -e list griddisk attributes name,size \ 
   where name like \'DATAC1.*\' "
   
   exa01celadm01: DATAC1_CD_00_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_01_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_02_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_03_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_04_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_05_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_06_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_07_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_08_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_09_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_10_exa01celadm01 676.0625G
   exa01celadm01: DATAC1_CD_11_exa01celadm01 676.0625G

Instead of increasing the size of the DATA disk group, you could instead create new disk groups with the new free space or keep it free for future use. In general, Oracle recommends using the smallest number of disk groups needed (typically DATA, RECO, and DBFS_DG) to give the greatest flexibility and ease of administration. However, there may be cases, perhaps when using virtual machines or consolidating many databases, where additional disk groups or available free space for future use may be desired.

If you decide to leave free space on the grid disks in reserve for future use, please see the My Oracle Support Note 1684112.1 for the steps on how to allocate free space to an existing disk group at a later time.