blackboard learning system - resilient architecture
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Blackboard Learning System - Resilient
Architecture
Szymon Machajewski Apr 22, 2009 | Comments (0)
Please review the visual aid first:
Architecture Brief
Standard resilient architecture:
Benefits: This architecture leverages hardware and system design which has been proven to
work on GRCC
campus. It also follows closely the recommendation from Blackboard in their
hardware sizing documents
to use hardware systems for both application servers and the database. Blackboard
suggests powerful
database servers: “We recommend 16GB to 32GB of memory per system” (BB Dell
hardware sizing doc).
The IBM 3650 has 48GB of RAM to allow for future growth and no hardware update
for 1-3 years.
In order for Oracle to use any amount of memory above 4G for SGA operation a
64bit system is required.
The failover approach to the database business continuity represents a balancebetween simplicity of the
database operations and the need for running a database in two locations. In case
of a failure in location
A, the database can be started in locat ion B within 15 minutes. The production
database system would
run at 100% of capacity in location B in case of location A failure.
The hardware used in this solution is generic and can be re-deployed to other
network services or
applications.
The complexity of application maintenance and their design is identical to
implementation in virtualized
environment. The hardware maintenance of stand-along systems impacts one
system at a time and isless visible to the application overall. Mirrored hard drives and reliable, mature Intel
hardware lends itself
well to low effort operations.
This architecture can be deployed speedily and will provide resilient approach for
the next 1-3 years
without modifications. The costs of keeping this architecture under warranty can be
gradual.
Considerations:
1U or 2U servers (U stands for unit of height in a rack furniture) can take up more
physical space and
consume more electricity than virtualization technology. Maintenance of the
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Documentation of processes and solutions relevant toBlackbaord, PeopleSoft, Oracle, RedHat Linux, MySQLand higher education.
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hardware in stand-alone
servers may require more effort, especially on servers which are out of warranty.
Running the database in non-clustered environment requires human intervention in
case of a serious
failure in location A.
Resilient architecture with virtualization:
Benefits:
Using hardware blades provides considerable gains in physical and environmental
properties of the datacenter. More servers can be installed in smaller spaces with blades. There are
considerable energy use
gains when implementing blade servers which share certain hardware resources.
Conceivably, when
there is fewer hardware pieces the hardware maintenance may be decreased. If
most of the stand-alone
hardware can be replaced with blade servers, this would standardize the data center
operations.
Considerations:
Existing hardware cannot be leveraged.
Blade servers come in chassis or groups which cannot be easily split to a third
location. Also thehardware may not be as flexible in re-deployment as stand-alone servers.
When the blade servers come out of warranty the replacement costs will not be
gradual or staged.
Solution summary:
The standard resilient architecture leverages existing hardware for the application
servers and allows for
gradual replacement of the IBM x346 family of servers. It requires a duplicate 64bit
database server to
provide business failover and continuity plan. The architecture is a standard
Blackboard architecture with
proven performance, support structures, and troubleshooting methods.
The virtualization architecture allows more compact and efficient physical server
properties as well asmore environment friendly operations. The hardware choices may be limiting for re-
deployment to other
applications in comparison with more generic stand-alone server hardware. Costs of
keeping blades
under warranty cannot be staged. RAC implementation helps to standardize and
share Oracle resources
across other then Blackboard databases.
Prepared by Szymon Machajewski, Senior Blackboard Solutions Engineer
References:
Blackboard Inc, Blackboard_Dell_Hardware_Sizing_Guide, downloaded from
behind.blackboard.com on
Apr 8, 2008.
Blackboard Inc, Blackboard_Sun_Hardware_Sizing_Guide, downloaded from
behind.blackboard.com on
Apr 8, 2008.
Oracle Corp, Oracle RAC Best Practices on Linux, White Paper, downloaded from
oracle.com on Apr 8,
2008
Blade Network Technologies, 10GbE iSCSI Performance with Blade servers,
downloaded form
media.netapp.com on Apr 8, 2008.
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