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 9 Volume Concept
RAID group 1 RAID group 2
Volume 1
Volume 2
Volume 3
A volume may be up to 128TB. However, the maximum capacity of volume varies depending on the OS of the
server.
The maximum number of volumes that can be created in the
ETERNUS AF is 3,072. Volumes can be created until
the combined total for each volume type reaches the maximum number of volumes.
A volume can be expanded or moved if required. Multiple volumes can be concatenated and treated as a single
volume. For availability of expansion, displacement, and concatenation for each volume, refer to "Target Vol-
umes of Each Function" (page 165).
The types of volumes that are listed in the table below can be created in the ETERNUS AF.
Table 7 Volumes That Can Be Created
Type Usage Maximum capacity
Standard (Open) A standard volume is used for normal usage, such as file sys-
tems and databases. The server recognizes it as a single logi-
cal 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. 128TB
Flexible Tier Volume (FTV) This volume is a target volume for layering. Data is automati-
cally redistributed in small block units according to the access
frequency. An FTV belongs to a Flexible Tier Pool.
128TB
Virtual Volumes (VVOLs) A VVOL is a VMware vSphere dedicated capacity virtualization
volume. Operations can be simplified by associating VVOLs
with virtual disks.
Its volume type is FTV.
128TB
Deduplication/Compression Volume This volume is a virtual volume that is recognized by the serv-
er when the Deduplication/Compression function is used. It
can be created by enabling the Deduplication/Compression
setting for a volume that is to be created. The data is seen by
the server as being non-deduplicated and uncompressed.
The volume type is TPV.
128TB
1. Function
RAID Functions
25
FUJITSU Storage ETERNUS AF250 S2, ETERNUS AF250 All-Flash Arrays
Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AG-1822-09ENZ0
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