Fujitsu ETERNUS DX S5 Series - 6 Configuration Settings for RAID Groups or Thin Provisioning; How RAID Groups and Thin Provisioning Are Used; When Using Standard Volumes

6. Configuration Settings for RAID Groups or Thin
Provisioning
This chapter describes the RAID group settings for Standard volumes and Snap Data volumes. This chapter also
describes the Thin Provisioning Pool settings for Thin Provisioning volumes.
Note
The Copybackless function is enabled by the factory default.
To operate with a fixed drive layout, set Copybackless to "Disable" with the "Setup Subsystem Parameters"
function. Refer to "Setup Subsystem Parameters" in "ETERNUS Web GUI User's Guide" for details.
How RAID Groups and Thin Provisioning Are Used
This section describes how RAID groups and Thin Provisioning are used.
RAID groups are areas for storing normal data that are used when the volume capacity requirements can be
estimated in advance. Business volumes and Advanced Copy volumes (Standard type volumes, WSVs, Snap Data
Volumes [SDVs], and Snap Data Pool Volumes [SDPVs]) can be created in RAID groups.
Thin Provisioning manages drives in a pool and assigns them to virtual logical volumes when data is written
from the host. Thin Provisioning enables operations to be started with less drive capacity even if the capacity
requirements cannot be estimated. Thin Provisioning Volumes (TPVs, NAS user volumes, and Deduplication/
Compression Volumes) are created in Thin Provisioning Pools (TPPs).
When Using Standard Volumes
The following sections describe the series of settings when creating Standard volumes.
Not only can new RAID groups be created, adding or changing volumes that are registered in existing RAID
groups can also be performed.
Standard volumes are also used as copy destination volumes for OPC, EC, or REC.
1 Create RAID Group
Create a RAID group (a group of drives that configures the RAID in the ETERNUS DX).
Refer to: "RAID Group Creation" (page 109)
2 Create Volume
Create a volume (drive area in the RAID group). A volume is a structural unit of RAID that can be
recognized from the server. Select "Standard" for "Type".
Refer to: "Operation Volume Creation" (page 112)
108 Configuration Guide (Basic)