Owner's Manual

20
A PS Series storage group can be segregated into multiple tiers or pools. Tiered
storage provides administrators with greater control over how disk resources are
allocated. At any one time, a member can be assigned to only one pool. It is easy
to assign a member to a pool and also to move a member between pools with no
impact to data availability. Pools can be organized according to different criteria,
such as disk types or speeds, RAID levels, application types. In Figure 9, pools are
organized by member RAID levels — one pool with the name RAID-10 consists
of RAID 10 members; one pool with the name RAID-5 consists of RAID 5
members.
Creating Volumes
Before data can be stored, the PS5000XV physical disks must be configured into
usable components, known as volumes. A volume represents a portion of the
storage pool, with a specific size, access controls, and other attributes. A volume
can be spread across multiple disks and group members and is seen on the
network as an iSCSI target. Volumes are assigned to a pool and can be easily
moved between pools, with no impact on data availability. In addition, automatic
data placement and automatic load balancing occurs within a pool, based on the
overall workload of the storage hardware resources within the pool.
Table 4. Volumes for Oracle RAC Configuration
Volume Minimum
Size
RAID Number of
Partitions
Used For OS Mapping
First Area
Volume
1024 MB 10 Three of 300
MB each
Voting Disk,
Oracle Cluster
Registry (OCR),
and SPFILE for
ASM instance
Three block
devices, each for
Voting Disk,
OCR, and
SPFILE
Second Area
Volume(s)
Larger than
the size of
your
database
10 One Data ASM disk group
DATABASEDG
Third Area
Volume(s)
Minimum
twice the
size of your
second area
volume(s)
5 One Flash Recovery
Area
ASM disk group
FLASHBACKDG