Table 7 Volumes That Can Be Created - Fujitsu ETERNUS DX60 S4 Design Manual

1. Function
RAID Functions
The maximum number of volumes that can be created in the ETERNUS DX is 1,024. 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
umes of Each Function" (page
The types of volumes that are listed in the table below can be created in the ETERNUS DX.

Table 7 Volumes That Can Be Created

Type
Standard (Open)
Snap Data Volume (SDV)
Snap Data Pool Volume (SDPV)
Thin Provisioning Volume (TPV)
Wide Striping Volume (WSV)
ODX Buffer volume
*1: When multiple volumes are concatenated using the LUN Concatenation function, the maximum capacity is
also 128TB.
*2: The capacity differs depending on the copy source volume capacity.
After a volume is created, formatting automatically starts. A server can access the volume while it is being for-
matted. Wait for the format to complete if high performance access is required for the volume.
In the ETERNUS DX, volumes have different stripe sizes that depend on the RAID level and the stripe depth
•
parameter.
For details about the stripe sizes for each RAID level and the stripe depth parameter values, refer to "ETER-
NUS Web GUI User's Guide".
Note that the available user capacity can be fully utilized if an exact multiple of the stripe size is set for the
volume size. If an exact multiple of the stripe size is not set for the volume size, the capacity is not fully
utilized and some areas remain unused.
When a Thin Provisioning Pool (TPP) is created, a control volume is created for each RAID group that config-
•
ures the relevant TPP. Therefore, the maximum number of volumes that can be created in the ETERNUS DX
decreases by the number of RAID groups that configure a TPP.
FUJITSU Storage ETERNUS DX60 S4, ETERNUS DX60 S3 Hybrid Storage Systems Design Guide (Basic)
144).
Usage
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.
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. 128TB
This volume is created by concatenating distributed areas in
from 2 to 12 RAID groups. Processing speed is fast because
data access is distributed.
An ODX Buffer volume is a dedicated volume that is required
to use the Offloaded Data Transfer (ODX) function of Windows
Server 2012 or later. It is used to save the source data when
data is updated while a copy is being processed.
It can be created one per ETERNUS DX.
Its volume type is Standard or TPV.
23
Copyright 2019 FUJITSU LIMITED
"Target Vol-
Maximum capacity
128TB (*1)
24 [MB] + copy source
volume capacity ´ 0.1 [%]
(*2)
2TB
128TB
1TB
P3AM-8992-14ENZ0