–
RAID 6 provides double data check; therefore, RAID 6 is complex and burdened by
heavy load. The read/write performance is lower than that of RAID 5.
–
RAID 10 provides high read and write performance. The more mirroring disks it has,
the higher read performance but lower write performance it provides.
l
Cost
–
The disk usage of a RAID 0 group is 100%, which means the lowest cost.
–
RAID 1 provides mirroring disks for a working disk, and the disk usage is 1/m, in which
m stands for the number of mirroring disks. A RAID 1 group has lower disk usage and
higher cost than a RAID 5 group.
NOTE
You can create RAID 0, RAID 5, RAID 6, and RAID 10 directly in the OSM3.0. To create RAID
1, you can set the number of disks in the mirroring group on the interface of creating RAID 10
to be the same as that of member disks.
–
The disk usage of a RAID 5 group is (n-1)/n, in which n stands for the number of member
disks. For example, a RAID group consisting of three hard disks has the lowest disk
usage, only 66.7%. The verification data in a RAID 5 group is equivalent of one hard
disk capacity. Therefore, a RAID 5 group has a low storage cost.
–
The disk usage in RAID 6 is
(
n-2)/n (n is the number of member disks in the RAID
group). When the RAID group is composed of four disks, the usage is the lowest only
50%. The amount of the check data in RAID 6 is equal to the capacity of two disks;
therefore, the storage cost of RAID 6 is higher than RAID 0 and RAID 5, and lower
than RAID 1 and RAID 10.
–
RAID 10 provides mirroring disks for a working disk, and the disk usage is 1/m, in
which m stands for the number of mirroring disks. A RAID 10 group has lower disk
usage and higher cost than a RAID 5 group.
3.2.2 Creating a RAID 0 Group
RAID 0 is suitable for unimportant services that requires high read/write ability, such as
streaming media. RAID 0 can be created conveniently on the OSM3.0.
Procedure
Step 1
On the OSM3.0 main interface, click
Service
. Then, in the
Service
navigation tree, expand the
RAID Group
node. Click
RAID Group Manager
.
Step 2
On the right of the
RAID Group Manager
interface, click
Create RAID Group
. The
Create
RAID Group
interface is displayed. See
Figure 3-3
.
OceanStor S5600 Storage System
Initial Configuration Guide
3 Configuring the Storage System
Issue 02 (2009-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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