The configuration of an S Series or extended storage pool specifies whether the object data should be encrypted and/or compressed when it is stored on the storage that is used for that pool. Encryption can be enabled only if it was enabled when HCP was first installed. If encryption was not enabled during installation, the System Management Console does not have an option to encrypt data.
If the encryption option is selected for an S Series or extended storage pool, the Storage Tiering service encrypts object data before writing it to the storage that is used for that pool. When reading encrypted data from an S Series or extended storage pool, HCP automatically decrypts the data.
![]() |
Note: If an extended storage tier contains multiple external storage pools, HCP evenly distributes object data that is stored on that tier across all of those pools. For this reason, each storage pool that is configured for a given extended storage tier should be configured to use the same encryption setting (enabled or disabled). |
To encrypt object data for S Series or extended storage, the Storage Tiering service uses the currently active PGP encryption key.
If compression is selected for an S Series or extended storage pool, the Storage Tiering service compresses the object data before writing it to the storage that is used for that pool. When reading compressed data from an S Series or extended storage pool, HCP automatically decompresses the data.
This compression activity is separate from the activity of the Compression/Encryption service. If an HCP object has been compressed by the Compression/Encryption service, HCP must decompress it before the Storage Tiering service can compress the object data and write it to S Series or extended storage.
![]() |
Note: If an extended storage tier contains multiple storage pools, HCP evenly distributes object data that is stored on that tier across all of those pools. For this reason, each extended storage pool that is configured for a given storage tier should be configured to use the same compression setting (enabled or disabled). |
If you change the encryption or compression setting for a given S Series or extended storage pool, the change affects only the data that is stored after you make the change. HCP does not change the data that is already stored on the storage that is used for the pool. As a result, an S Series or extended storage pool may contain both encrypted and unencrypted data and both compressed and uncompressed data at the same time.
© 2015, 2020 Hitachi Vantara LLC. All rights reserved.