Volume; Figure 4 Volume Concept; Table 10 Number Of Volumes That Can Be Created; Table 11 Volumes That Can Be Created - Fujitsu ETERNUS AF S3 Series Design Manual

2. Basic Functions
RAID Functions

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
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 AF is shown below. Volumes can be created until the
combined total for each volume type reaches the maximum number of volumes.
Table 10 Number of Volumes That Can Be Created
Model
ETERNUS AF150 S3
ETERNUS AF250 S3
ETERNUS AF650 S3
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
Volumes of Each Function" (page
The types of volumes that are listed in the table below can be created in the ETERNUS AF.
Table 11 Volumes That Can Be Created
Type
Standard (Open)
Snap Data Volume (SDV)
Snap Data Pool Volume (SDPV)
Thin Provisioning Volume (TPV)
Flexible Tier Volume (FTV)
Volume 1
Volume 2
RAID group 1
Number of volumes (max.)
4,096
8,192
16,384
199).
Usage
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.
This area is used as the copy destination for SnapOPC/SnapOPC+.
There is a SDV for each copy destination.
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.
This virtual volume is created in a Thin Provisioning Pool area. TPVs
are used as the copy destination for SnapOPC+.
This volume is a target volume for layering. Data is automatically
redistributed in small block units according to the access frequency.
FTVs are used as the copy destination for SnapOPC+. An FTV
belongs to a Flexible Tier Pool.
RAID group 2
27
Volume 3
"Target
Maximum capacity
128TB (*1)
24 [MB] + copy source volume
capacity ´ 0.1 [%] (*2)
2TB
128TB
128TB
Design Guide