Disabling accelerated compression on a parity group

Use the following workflow to disable accelerated compression on a parity group.

1. For the targeted pool, use the following formulas to determine whether the shrink pool operation can be performed:
   • Pool capacity after shrinking =

     (pool-capacity-before-shrinking) - (total-capacity-of-pool-VOLs-with-Expanded-Space-Used=Yes)
     	

   • Decision formula:

     (used-pool-capacity) < (pool-capacity-after-shrinking) × (depletion-threshold) 
      

   If the condition of the decision formula is met, you can delete pool-VOLs with Expanded Space Used = Yes. Go to step 3.

   If the condition of the decision formula is not met, you cannot delete pool-VOLs with Expanded Space Used = Yes. Go to step 2.

2. Expand the pool.

   For the LDEVs to be added as pool-VOLs, use LDEVs with Expanded Space Used = No. Add capacity that is larger than the total of pool-VOLs with Expanded Space Used = Yes.

3. Shrink the pool so that all pool-VOLs in the pool are deleted.
4. Format the LDEVs with Expanded Space Used = Yes.
5. Delete the LDEVs with Expanded Space Used = Yes.

Parent Topic

• Guidelines for pools when accelerated compression is enabled

  You must follow specific guidelines for sizing, creating, and maintaining a pool that uses LDEVs carved from parity groups with accelerated compression enabled.