7.7.6.6 DROP GRIDDISK

Purpose

The DROP GRIDDISK command removes the named grid disks or removes all the grid disks specified by the ALL option.

Caution:

Before dropping a grid disk, ensure that it is not part of any Oracle ASM disk group or Exascale storage pool.

Syntax

DROP GRIDDISK 
   { ALL [[ CAPACITYOPTIMIZED | PERFORMANCEOPTIMIZED ] FLASHDISK | HARDDISK ] PREFIX={[']gdisk_name_prefix[']|'gdisk_name_prefix1[,gdisk_name_prefix2]...'} 
   | gdisk_name1[,gdisk_name2]... }
   [ERASE=value [NOWAIT]] [FORCE]

Usage Notes

  • If one or more grid disk names (gdisk_name1, gdisk_name1, and so on) are specified, then each name identifies the individual grid disk to be removed.

  • Starting with Oracle Exadata System Software release 24.1.0, you can optionally specify CAPACITYOPTIMIZED or PERFORMANCEOPTIMIZED before FLASHDISK to drop grid disks on cell disks associated with the specified flash media type.

    If you do not fully specify the flash media type, ALL FLASHDISK is equivalent to ALL CAPACITYOPTIMIZED FLASHDISK on Extreme Flash (EF) storage servers containing capacity-optimized flash devices. On all other storage servers, ALL FLASHDISK is equivalent to ALL PERFORMANCEOPTIMIZED FLASHDISK.

  • If the ALL option is specified with a media type qualifier (FLASHDISK or HARDDISK), the command only drops grid disks on cell disks associated with the specified media type.

    Starting with Oracle Exadata System Software release 24.1.0, if you specify the ALL option without a media type qualifier (FLASHDISK or HARDDISK), then the command drops grid disks on the cell disks associated with the primary storage media on the storage server. Specifically:

    • On Extreme Flash (EF) storage servers containing capacity-optimized flash devices, ALL with no media type qualifier is equivalent to ALL CAPACITYOPTIMIZED FLASHDISK.

    • On Extreme Flash (EF) storage servers containing only performance-optimized flash devices, ALL with no media type qualifier is equivalent to ALL PERFORMANCEOPTIMIZED FLASHDISK.

    • On all storage servers containing hard disk drives (HDDs), ALL with no media type qualifier is equivalent to ALL HARDDISK.

    Before Oracle Exadata System Software release 24.1.0, if the ALL option is specified without a media type qualifier, the command drops all matching grid disks regardless of media type.

  • The PREFIX option must be specified when ALL is used.

    The PREFIX option specifies one or more comma-separated prefix strings, which are used to identify the grid disks being dropped.

  • If any of the grid disks are in use when DROP GRIDDISK is issued, then an error is reported. You can use ALTER GRIDDISK with the INACTIVE option to deactivate a grid disk before dropping the grid disk. This action ensures that the grid disk is not in use.

  • The FORCE option can be used to force the drop of a grid disk that is in use.

  • If you drop a flash-based grid disk, the space is not automatically allocated to FLASHCACHE. You can use the CREATE FLASHCACHE command to reuse the dropped area for FLASHCACHE.

  • The ERASE option erases the content on the disk by overwriting the content. The values are as follows:

    • 1pass: One pass, and the content is overwritten with zeros. This value is not available for flash drives.

    • 3pass: Three passes, and the disk is overwritten with set data patterns. This option follows the recommendations from NSA. This value is not available for flash drives.

    • 7pass: Seven passes, and the disk is overwritten with set data patterns. This option follows the recommendations from DOD.

  • DROP GRIDDISK ERASE cannot be used for PMEM grid disks.

  • When dropping all grid disks using the 1pass or 3pass option, it necessary to drop the flash disks first using the 7pass option, and then drop the grid disks. The following is an example of the commands: 

    CellCLI> DROP GRIDDISK ALL FLASHDISK PREFIX=data, ERASE=7pass 
CellCLI> DROP GRIDDISK ALL PREFIX=data, ERASE=1pass

  • Use the NOWAIT option with the ERASE option to run the command asynchronously.

Example 7-129 Examples of Dropping a Grid Disk

CellCLI> ALTER GRIDDISK data01_CD_03_cell01 INACTIVE

CellCLI> DROP GRIDDISK data01_CD_03_cell01

CellCLI> DROP GRIDDISK ALL PREFIX=data01

CellCLI> DROP GRIDDISK data02_CD_04_cell01 FORCE

CellCLI> DROP GRIDDISK data02_CD_04_cell01 ERASE=1pass
GridDisk data02_CD_04_cell01 successfully dropped 

CellCLI> DROP GRIDDISK ALL FLASHDISK PREFIX=DATA ERASE=7pass
CellCLI> DROP GRIDDISK ALL PREFIX=DATA ERASE=3pass

Related Topics

Parent topic: DROP