Set Deduplication/Compression Mode
Overview
This function enables or disables the Deduplication/Compression function for the storage system.
If the Deduplication/Compression function is enabled, the duplicated data blocks in TPP are deleted and compressed to reduce the used area of the drive.
This function is supported in the ETERNUS DX200 S5, the ETERNUS DX500 S5/DX600 S5/DX900 S5, the ETERNUS DX8900 S4, and the ETERNUS AF250 S3/AF650 S3. The ETERNUS DX900 S5 or the ETERNUS DX8900 S4 supports Compression only.
If the storage system is used in a Unified Storage environment, the Deduplication/Compression setting cannot be set for both NAS user volumes (TPVs) and SAN volumes (TPVs).
If this function is enabled, the performance may be reduced depending on the I/O environment. For notes on using this function, refer to "Design Guide".
Only Deduplication/Compression Volumes in the same TPP are the targets of Deduplication/Compression. TPVs that are not Deduplication/Compression Volumes, and NAS volumes are not supported.
Checking for duplications across multiple TPPs is not supported.
When this function is enabled, the cache mode is temporarily changed to "Write Through Mode". The workload I/O performance of the entire storage system is lowered when the cache mode is transitioning to "Write Through Mode". Therefore, it is recommended to use this function when work I/O is low. This process may take up to several tens of minutes.
If this function is changed from "Enable" to "Disable", reboot the storage system. Note that rebooting the storage system is not required if this function is changed from "Disable" to "Enable".
If the Deduplication/Compression Volume is used as a copy source volume, the copy process is performed after the data is decompressed. If the Deduplication/Compression Volume is used as a copy destination volume, the data that is transferred from the copy source is deduplicated and compressed. Because of that, the copy performance is affected.
- This function cannot be enabled when the storage system is used in the Unified Storage environment.
- This function cannot be disabled under the following conditions:
TPPs that have either or both of Deduplication and Compression enabled exist
The current user does not have the "Maintenance Operation" policy
Check "Deduplication/Compression" in the [System] screen. If "Enable" is displayed for "Deduplication/Compression", skip this function. Refer to the [System] function for details.
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User Privileges
Availability of Executions in the Default Role
Default role | Availability of executions |
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Monitor | |
Admin | |
StorageAdmin | |
AccountAdmin | |
SecurityAdmin | |
Maintainer |
Refer to "User Roles and Policies" for details on the policies and roles.
Settings
Deduplication/Compression Mode Settings
Item | Description | Setting values |
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Deduplication/Compression |
Select whether to enable or disable the Deduplication/Compression function for the storage system. Note
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The display contents vary depending on the current user's policy.
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Operating Procedures
Click [Set Deduplication/Compression Mode] in [Action].
Select whether to enable or disable Deduplication/Compression and click the [Set] button.
→ A confirmation screen appears.
Click the [OK] button.
→ The Deduplication/Compression mode setting starts.
Click the [Done] button to return to the [System] screen.
CautionReboot the storage system if "Disable" is selected for "Deduplication/Compression".