Table 10 Method For Enabling The Deduplication/Compression Function - Fujitsu ETERNUS AF250 Design Manual

1. Function
Operations Optimization (Deduplication/Compression and Storage Virtualization)
The performance may decline when the Deduplication/Compression function is enabled. Using the Dedupli-
•
cation/Compression function is not recommended for the volumes that are used to store performance-sensi-
tive 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.
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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 10 Method for Enabling the Deduplication/Compression Function

Condition of the TPP
A newly created TPP
A TPP that is created with a controller
firmware version earlier than V10L70
A TPP that is created with a controller
firmware version V10L70 and later (the
Dedup Ready setting is specified when
the TPP is created)
A TPP that is created with a controller
firmware version V10L70 and later (the
Dedup Ready setting is not specified
when the TPP is created)
*1: The chunk size can be checked in the detail display of the TPP.
*2: This setting is available only if the TPP is created with the AUTO mode. In consideration of the load bal-
ancing for the Deduplication/Compression process, using this creation method is recommended. If the
TPP can only be configured with one RAID group, the Deduplication/Compression function cannot be ena-
bled.
*3: The Deduplication/Compression function can be enabled even if the TPP is configured with only one RAID
group. However, if the TPP is configured with one RAID group, the load of the Deduplication/Compression
processes cannot be balanced efficiently. Enabling the Deduplication/Compression function for a TPP that
is configured with two or more RAID groups is recommended.
*4: To create a TPP with a chunk size of 21MB, specify the Dedup Ready option when creating the TPP.
*5: This function cannot be performed if the chunk size of the TPP is not 21MB.
Configuration method for the Deduplication/Compression function
•
Select the TPP where the Deduplication/Compression function is enabled, and create Deduplication/Compres-
sion Volumes (TPVs) in the selected TPP.
Chunk size (*1)
21MB
21MB
21MB
21MB
Other than 21MB
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41
Creation method
Select AUTO mode and specify an option
for the Deduplication/Compression func-
tion to enable the function (*2)
Select a target TPP to enable the Dedu-
plication/Compression function (*3)
Select a target TPP to enable the Dedu-
plication/Compression function (*3) (*4)
Select a target TPP to enable the Dedu-
plication/Compression function (*3) (*4)
Deduplication/Compression function can-
not be enabled (*5)
P3AG-1822-09ENZ0