Volume
This section explains volumes.
Logical drive areas in RAID groups are called volumes.
A volume is the basic RAID unit that can be recognized by the server.
Figure 4 Volume Concept
RAID group 1 RAID group 2
Volume 1
Volume 2
Volume 3
The maximum capacity of a volume is 128TB. However, the maximum capacity of volume varies depending on
the OS of the server.
The number of volumes that can be created in the
ETERNUS DX is shown below. Volumes can be created until
the combined total for each volume type reaches the maximum number of volumes.
Table 16 Number of Volumes That Can Be Created
Model Number of volumes (max.)
ETERNUS DX60 S5 1,024
ETERNUS DX100 S5 4,096
ETERNUS DX200 S5 8,192
ETERNUS DX500 S5/DX600 S5 16,384
ETERNUS DX900 S5 65,535
A volume can be expanded or moved if required. Multiple volumes can be concatenated and treated as a single
volume. For the availability of expansion, migration, and concatenation for each volume, refer to "
Target
Volumes of Each Function" (page 323).
The types of volumes that are listed in the table below can be created in the ETERNUS DX.
Table 17 Volumes That Can Be Created
Type Usage Maximum capacity
Standard (Open) A standard volume is used for normal usage, such as file systems
and databases. The server recognizes it as a single logical unit.
"Standard" is displayed as the type for this volume in ETERNUS Web
GUI/ETERNUS CLI and "Open" is displayed in ETERNUS SF software.
128TB (*1)
Snap Data Volume (SDV) This area is used as the copy destination for SnapOPC/SnapOPC+.
There is a SDV for each copy destination.
24 [MB] + copy source volume
capacity ´ 0.1 [%] (*2)
Snap Data Pool Volume (SDPV) This volume is used to configure the Snap Data Pool (SDP) area.
The SDP capacity equals the total capacity of the SDPVs. A volume is
supplied from a SDP when the amount of updates exceeds the
capacity of the copy destination SDV.
2TB
Thin Provisioning Volume (TPV) This virtual volume is created in a Thin Provisioning Pool area. TPVs
are used as the copy destination for SnapOPC+.
128TB
2. Basic Functions
RAID Functions
40 Design Guide
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