Intel® Raid High Availability Storage Terminology; Intel ® Raid High Availability Storage Solution Features - Intel RAID High Availability Storage User Manual

virtual drives (VDs) are managed by a single initiator. In the case of Intel® RAID High
Availability Storage, I/O transactions and RAID management operations are processed by a
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single Intel RAID High Availability Storage controller, and the associated physical drives, drive
groups, and VDs are only visible to that controller. This key functionality allows the Intel
High Availability Storage solution to share VDs among multiple initiators as well as exclusively
constrain VD access to a particular initiator without the need for SAS zoning.
Node downtime in an HA system can be either planned or unplanned. Planned node downtime
is the result of management-initiated events, such as upgrades and maintenance. Unplanned
node downtime results from events that are not within the direct control of IT administrators,
such as failed software, drivers, or hardware. The Intel
protects your data and system up-time from unplanned node downtime. It also enables you to
schedule node downtime to update hardware or firmware, and so on. When you bring one
controller node down for scheduled maintenance, the other node takes over with no interruption
of service.
Intel® RAID High Availability Storage Terminology
This section defines some additional important Intel® RAID High Availability Storage terms.
Cache Mirror: A cache coherency term describing the duplication of write-back cached data across
two controllers.
Exclusive Access: A host access policy in which a VD is only exposed to, and accessed by, a single
specified server.
Failover: The process in which the management of drive groups and VDs transitions from one
controller to the peer controller to maintain data access and availability.
HA Domain: A type of storage domain that consists of a set of HA controllers, cables, drive
enclosures, and storage media.
Peer Controller: A relative term to describe the HA controller in the HA domain that acts as the
failover controller.
Server/Controller Node: A processing entity composed of a single host processor unit or multiple
host processor units that is characterized by having a single instance of a host operating system.
Server Storage Cluster: An HA storage topology in which a common pool of storage devices is
shared by two computer nodes through dedicated Intel
A host access policy in which a VD is exposed to, and can be accessed by, all servers
in the HA domain.
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Intel RAID High Availability Storage Solution Features
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The Intel RAID High Availability Storage solution supports the following HA features.
 Server storage cluster topology
 Dual-active HA with shared storage
 Controller-to-controller intercommunication over SAS
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Intel High Availability Storage User Guide
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RAID High Availability Storage solution
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RAID High Availability Storage controllers.
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RAID
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