If Encryption is enabled on an FMC parity group, you cannot compress encrypted data and accelerated compression cannot be enabled on that parity group. You can either encrypt or compress your data.Accelerated compression-enabled parity groups
Data on LDEVs carved from parity groups comprised of FMC drives is compressed before it is stored onto the drives. However, accelerated compression is not enabled by default; you need to enable accelerated compression to take advantage of the data compression services on FMC drives.
If Encryption is enabled on an FMC parity group, you cannot compress encrypted data and accelerated compression cannot be enabled on that parity group. You can either encrypt or compress your data.
When you enable accelerated compression on a parity group comprised of FMC drives:
The capacity of the parity group expands to eight times the usable physical capacity of the parity group. You can carve out LDEVs from this expanded capacity and use them as pool volumes to create or expand a pool. When you do this, you can utilize the increased available capacity because the data on the FMC drives has been compressed.
LDEVs carved from the accelerated compression-enabled parity groups can only be used as pool volumes to create or expand a pool. These LDEVs cannot be assigned directly to a Host and must be assigned to a single pool as pool volumes. LDEVs from a single parity group cannot be shared among multiple pools. 