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Resizing Grid Disks in Exadata: Example of Recreating RECO Grid Disks in a Rolling Manner (Doc ID 1465230.1)

Last updated on JANUARY 17, 2020

Applies to:

Oracle Exadata Storage Server Software - Version 11.2.1.3.1 to 12.1.2.1.0 [Release 11.2 to 12.1]
Information in this document applies to any platform.

Goal

This procedure describes how to resize ASM disk groups to shrink one with excess free space and grow another that is near capacity.  Typically, the RECO disk group will be shrunk down and the DATA disk group will grow.  This procedure works particularly well in cases where the DATA disk group is almost full and the RECO disk group has enough free space to permit rebalancing at least a single cell’s worth of data.

If your grid disks have sufficient free space to expand your disk group, then you may be able to use the simpler procedure in note 1684112.1.

This procedure is deprecated in favor of the one in 2176737.1 : How to Resize Grid Disks in Exadata.  This procedure will increase griddisks while keeping space contiguous on the disk and in the same offset order.  This is a time-consuming and complex procedure that originally was done to optimize I/O performance, but this optimization is no longer needed with the use of writeback flashcache.

    

Solution

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In this Document
Goal
Solution
 Overview
 Procedure
 1. Ensure prerequisites are met
 2.  Calculate RECO and DATA disk group and grid disk sizing changes
 3. Resize the ASM disks in the RECO Disk Group
 4.  DROP ASM disks from RECO Disk group on the first cell
 5. Wait for Rebalance to Finish
 6. Drop the RECO grid disks on the cell
 7. Resize the DATA grid disk on the cell to the new larger size
 8. Recreate RECO grid disks on the cell to a smaller size
 9.  Add RECO ASM disks from the cell to the RECO Disk group and drop RECO ASM disks from the next cell
 10. Wait for Rebalance to Finish
 11. Repeat steps 5 through 10 for the remaining cells
 12. Wait for Rebalance to Finish
 13. Resize all DATA grid disks up to the desired size
 14. Wait for Rebalance to Finish
 15. Verify all sizes
 16. End of Procedure
References

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