Create Raid Group - Fujitsu ETERNUS DX60 S3 User Manual

Chapter 5 RAID Group Management

5.1 Create RAID Group

5.1

Create RAID Group

This function creates RAID groups.
A RAID group is a group of drives that configure a RAID level.
For RAID groups that configure Thin Provisioning Pools, the required RAID levels and number of member
drives that can be used are different. Refer to
Features and required number of drives for each RAID level
The following table shows the features and the required number of drives for each RAID level.
Actual RAID group configurations (or the number of available drives) vary depending on the maximum
number of drives that can be installed in the ETERNUS DX.
Note that "Striping (RAID0)" has no data redundancy.
RAID level
High Performance
(RAID1+0)
High Capacity
(RAID5)
High Reliability
(RAID6)
High Reliability
(RAID6-FR)
Reliability
(RAID5+0)
Mirroring (RAID1)
Striping (RAID0)
*1: D: Data drives, M: Mirror drives, P: Parity drives, HS: Hot Spares
"6.2 Create Thin Provisioning Pool" (page 559)
Feature
The high I/O performance of RAID0 (striping) is combined
with the reliability of RAID1 (mirroring).
Data divided into units of blocks and parity information
that is created from the data are allocated across multiple
drives to allow data redundancy.
The use of double parity allows the full recovery of lost data
even in the event that two of the drives fail.
Configure a single RAID group with multiple RAID
redundant sets and reserved areas equivalent to a hot
spare. Distributing data in RAID groups allows high-speed
rebuilding when the first drive fails. A recovery can be
performed with up to two drive failures, however when the
second drive fails, the rebuild is operated at a normal
speed. Several restrictions apply to the RAID groups and
volumes of this RAID level. For the details, refer to
"Restrictions for RAID6-FR" (page
Multiple RAID5 volumes are RAID0 striped. For large
capacity configurations, use of RAID5+0 instead of RAID5
results in enhanced performance, improved reliability, and
shorter rebuilding times. Several restrictions apply to the
RAID groups of this RAID level. For the details, refer to
"Restrictions for RAID5+0" (page
Data is mirrored to two drives.
If one drive fails, the other drive continues operation
(mirroring).
Data is split in unit of blocks and stored across multiple
drives (striping).
RAID0 has no data redundancy.
527
ETERNUS Web GUI User's Guide (Settings)
Copyright 2015 FUJITSU LIMITED
2D+2M – 16D+16M
2D+1P – 15D+1P
3D+2P – 14D+2P
(3D+2P)x2+1HS
(4D+2P)x2+1HS
(6D+2P)x2+1HS
(9D+2P)x2+1HS
(12D+2P)x2+1HS
(5D+2P)x4+1HS
(13D+2P)x2+1HS
(8D+2P)x3+1HS
(4D+2P)x5+1HS
528).
(3D+2P)x6+1HS
(2D+1P)x2 – (15D+1P)x2
528).
1D+1M
2D – 16D
for details.
Required number of drives (*1)
P2X0-1270-13ENZ0