Owner's Manual

17
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 2, 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 shows a sample volume configuration. Create volumes in PS5000XV
array and create access list to allow all host iSCSI network interfaces to access
the volumes.
Table 4. Volumes for Oracle RAC Configuration
Volume Minimum Size RAID Number of Partitions Used For OS Mapping
First Area
Volume
1024 MB 10 One extended
partition with two
logical drives - 50
MB for Voting
Disk and 120 MB
for OCR
Voting disk
and Oracle
Cluster
Registry
(OCR)
One extended
partition with two
logical drives:
1 x Voting Disk,
1 x OCR
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