Owner's Manual

46 Setting Up an iSCSI Cluster
An EqualLogic 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 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, and
application types.
In Figure 5-2, pools are organized by member RAID levels:
• One pool with the name RAID 10 consists of RAID10 members.
• One pool with the name RAID 5 consists of RAID 5 members.
Creating Volumes
Before storing data, configure the physical disks of the EqualLogic PS6010XV
storage array 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.
The volume 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 to data
availability. In addition, based on the overall workload of the storage hardware
resources within the pool, automatic data placement and automatic load
balancing occurs within a pool.