Note
•
The performance may decline when the Deduplication/Compression function is enabled. The
Deduplication/Compression function is not recommended for volumes used to store performance-
sensitive data.
•
Batch process (or sequential access) performance significantly degrades because data is written to
drives intermittently or a large amount of references and updates occur. In environments where
sequential access occurs, using the Deduplication/Compression function is not recommended.
•
The Deduplication/Compression function becomes a disadvantage in terms of performance and
capacity if a volume stores data such as videos to which deduplication/compression is not effective
and the volume is set as a Deduplication/Compression Volume. Only enable either the Deduplication
function or the Compression function.
●
Configuration Method
•
Enabling the Deduplication/Compression function
From ETERNUS Web GUI or ETERNUS CLI, enable the Deduplication/Compression function for the TPP. Not
only can the Deduplication/Compression function be enabled, but the Deduplication function or the
Compression function can be individually enabled.
The Deduplication/Compression function can be enabled by performing one of the methods below.
Table 15
Method for Enabling the Deduplication/Compression Function
Condition of the TPP
Chunk size (*1)
Creation method
New TPP (recommended)
21MB
During the TPP creation, select the Automatic mode and specify the
Deduplication/Compression function option to enable it
21MB (default) –
336MB (*2)
During the TPP creation, select the Manual mode and specify the
Deduplication/Compression function option to enable it
Existing TPP
21MB – 336MB (*3)
Select a target TPP to enable the Deduplication/Compression function
(*4)
*1:
The chunk size can be checked in the list display of the TPP.
*2:
The chunk size can be changed only if the maximum pool capacity is selected. Select the chunk size (21MB – 336MB) from
Advanced Settings. For normal operations, the default value (21MB) does not need to be changed.
*3:
The chunk size (21MB – 336MB) during a TPP creation is maintained. The Deduplication/Compression function can be enabled for
TPPs whose chunk sizes are not 21MB.
*4:
If I/O load exists in the ETERNUS AF, enabling or disabling the Deduplication/Compression function in the TPP may take time. If
I/O load exists, changing the setting of the Deduplication/Compression function for each TPP is recommended.
•
Configuration method for the Deduplication/Compression function
Select the TPP where the Deduplication/Compression function is enabled, and create Deduplication/
Compression Volumes (TPVs) in the selected TPP.
Specify whether to enable or disable the Deduplication/Compression function for each TPV. TPVs (or
Deduplication/Compression Volumes) where the Deduplication/Compression function is enabled and
disabled can exist together within the same TPP. However, these two types of TPVs should be located in
separate TPPs.
Deduplication is performed for Deduplication/Compression Volumes within the same TPP. Deduplication is
not performed for data in different TPPs. In some cases, deduplication might not be performed even
within the same TPP.
To enable the Deduplication/Compression function for existing volumes, use the RAID Migration function.
2. Basic Functions
Operations Optimization (Deduplication/Compression and Storage Virtualization)
45
Design Guide
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