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2. Basic Functions
Operations Optimization (Deduplication/Compression and Storage Virtualization)
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Deduplication/Compression Volumes
The physical capacity may temporarily be larger than the logical capacity that is written because data is
appended in Deduplication/Compression Volumes. If the I/O load is high, the physical capacity may run out.
Monitoring the physical capacity on a regular basis and enabling SNMP notifications are recommended.
Caution
• The deduplication rate may temporarily decrease due to a CM failure, a firmware update, or a
blackout.
• If a failure occurs in a RAID group configuring the TPP, or a bad sector occurs in the DATA_CNTNR
Volume, the data of all the Deduplication/Compression Volumes in the TPP may be deleted.
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Functional Details
Figure 19
A
B
C
D
I/O request
Deduplication/
Compression Volume
(a virtual volume that
can be seen
from the server)
Details of the Deduplication/Compression Function
Server
A
B
E
F
A
A
B
B
Maps the Deduplication/Compression
C
E
Volume (or the virtual volume)
D
F
and the actual written data
Non-Deduplication/
Thin Provisioning Pool (TPP)
DATA_CNTNR (TPV)
Actual written data after
Compression
deduplication/compression
Volume (TPV)
47
ETERNUS AF
A
B
C
E
D
F
Design Guide
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