Volumes that are to be created and the Deduplication/Compression setting for TPPs where the target
volumes can be created vary depending on the selection of "Deduplication" and "Compression".
•
Volumes that are to be created
Table 16
Volumes That Are to Be Created depending on the Selection of "Deduplication" and
"Compression"
Condition
Volumes that are to be created
Deduplication
Compression
Enable
Enable
Deduplication/Compression Volumes where both Deduplication and
Compression are enabled
Enable
Disable
Deduplication/Compression Volumes where only Deduplication is enabled
Disable
Enable
Deduplication/Compression Volumes where only Compression is enabled
Disable
Disable
TPVs for SAN where both Deduplication and Compression are disabled
•
Deduplication/Compression setting for TPPs where the volumes can be created
Table 17
Deduplication/Compression Setting for TPPs Where the Target Volumes Can Be Created
Condition
Deduplication/Compression setting for the destination TPP
Deduplication
Compression
Only Deduplication
is enabled
Only Compression
is enabled
Both Deduplication
and Compression
are enabled
Both Deduplication
and Compression
are disabled
Enable
Enable
´
´
¡
´
Enable
Disable
¡
´
´
´
Disable
Enable
´
¡
´
´
Disable
Disable
¡
¡
¡
¡
¡
: Volumes can be created,
´
: Volumes cannot be created
Note
TPPs with the Deduplication/Compression function enabled have one of the following attributes:
deduplication/compression, deduplication only, or compression only. The Deduplication/Compression
Volume conforms to the attribute of the TPP where the volume is created. TPVs where the
Deduplication/Compression function is enabled and disabled can exist together within each TPP.
●
Deduplication/Compression System Volumes
One DATA_CNTNR Volume is created for each TPP where the Deduplication/Compression function is enabled.
Before enabling the Deduplication/Compression function for a TPP, check whether the remaining capacity is
sufficient because the DATA_CNTNR volume is created just within the maximum pool capacity.
Because the data after deduplication/compression is stored in the DATA_CNTNR Volume, add RAID groups to
the TPP or expand the DATA_CNTNR Volume before the usage rate of the TPP or the usage rate of the
DATA_CNTNR Volume reaches 100%.
The DATA_CNTNR Volume cannot be expanded to a capacity larger than the maximum pool capacity. If the
capacity of the DATA_CNTNR Volume exceeds the maximum pool capacity, use the RAID Migration function
to migrate the Deduplication/Compression Volumes of the TPP to non-Deduplication/Compression Volumes
(TPVs) or another TPP. For details on the maximum logical capacity of the DATA_CNTNR Volume, refer to
.
Apart from the data after deduplication/compression, the control information is written to the DATA_CNTNR
Volume. The physical capacity that is used for the control information is the total of the fixed capacity of 4GB
maximum and the variable capacity (1 - 15%) according to the written size from the server.
2. Basic Functions
Operations Optimization (Deduplication/Compression and Storage Virtualization)
46
Design Guide
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