What is clustering
ØConnecting two or
more computers together in such a way that they behave like a single computer.
Ø Clustering is used for parallel processing
load balancing and fault tolerance.
What is failover clustering
A failover cluster is a group of servers
that work together If one of the servers, or nodes, fails, another node in the
cluster can take over its workload without any downtime (this process is known
as failover).
Can be classified into….
•Active/Passive
•Active/Active
How to detect failure
•Push heartbeats
•Pull heartbeats
•Push
heartbeats. For push
heartbeats, the active server
sends specified signals to the standby server at a well-defined interval. If
the standby server does not receive a heartbeat signal over a certain time
interval, it determines that the active server failed and takes the active
role.
ÒPull heartbeats. For pull heartbeats, the standby server sends a
request to the active server. If the active server does not respond, the
standby server repeats the request a specific number of times. If the active
server still does not respond, the standby server takes over as the active
server.
Hardware requirements
•Servers: We recommend that
you use a set of matching computers that contain the same or similar
components.
•Network
adapters and cable (for network communication): If you use iSCSI, each network adapter should be dedicated to either
network communication or iSCSI, not both.
•Storage: You must use shared
storage that is compatible with Windows Server 2012 R2 or Windows Server 2012.
Benefits
ÒScalability
ÒHigh Availability
ÒHigh Performance
No comments:
Post a Comment