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Availability
In this fast-paced society, data needs to be available to clients whenever they
need it. SAS was designed with availability in mind. SAS include the following
benefits:
•
Dual ports for redundant controller functionality
•
Support for multiple initiators
•
Hot swappable for easy removal / replacement of the SAS drive
1.4 Array Definition
1.4.1 RAID Set
A RAID Set is a group of disks containing one or more volume sets. It has the
following features in the RAID subsystem controller:
1. Up to 128 RAID Sets are supported per RAID subsystem controller.
2. It is impossible to have multiple RAID Sets on the same disks.
A Volume Set must be created either on an existing RAID set or on a group of
available individual disks (disks that are not yet a part of a raid set). If there
are pre-existing raid sets with available capacity and enough disks for
specified RAID level desired, then the volume set will be created in the
existing raid set of the user’s choice. If physical disks of different capacity
are grouped together in a raid set, then the capacity of the smallest disk will
become the effective capacity of all the disks in the raid set.