dell oem beyond controllers and capacitors power point

8/4/2019 Dell OEM Beyond Controllers and Capacitors Power Point

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U N D E R S T A N D I N G S Y S T E M R E D U N D A N C Y

B Y J O S H N E L A N D A N D F R A N K L I N F L I N T

Beyond Controllers andCapacitors


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Fast Forward

Evaluate redundancy opportunities within systemand subsystem software.

Eliminate single points of failure in hardware

infrastructures. Configure redundancy in servers, power, cooling,

and networking.


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S T A R T A T A H I G H L E V E L W I T H T H E S O F T W A R E

E N V I R O N M E N TD E T E R M I N E A S T R A T E G Y F O R B U I L D I N G T H ER E Q U I R E D A V A I L A B I L I T Y L E V E L S I N T O T H EV A R I O U S S U B S Y S T E M S

Clustering software enables automatic failover from afaulty node to a different node in a cluster.

Virtualization allows different types of software stacksto be managed in a uniform way.

Match the responsiveness of a chosen solution to therequirements during the design phase.

Nodes should minimize state and fail gracefully.

Building High Availability


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Active/Active Active/Passi

The primary and reservenodes are running the

database at any giventime

Low failover latency Easy expansion

Load balancing Requires nodes to be

designed so they can runconcurrently

Provides a fully redundantnode for each operationalnode in the system

The redundant node isbrought online only if theactive node fails

Simpler to implement Cost of providing a fully

redundant set of nodes(and hardware) can be high

Active/Active and Active/PassiveConfigurations


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The difference

betweenDedicated and

Multi-purposedNodes

With dedicated nodes,you must decide howmany redundant nodesto provide for eachinterface.

With multi-purposednodes, a single sharedpool of extra nodes canprovide the redundancyfor any of the interfaces.


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Evaluating Required Interface Behavior

Make external interfaces highly available byimplementing a retry policy internally acrossredundant nodes of any subsystem.

Design the system to achieve availability at theunderlying storage level.

All the subsystems should access shared, centralizedstorage.

Replicate databases and regularly update the copies.


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Configuring Hardware for Redundancy

Hardware redundancy startswith the selection of servertechnology.

Blade servers are more space-efficient and energy-efficientthan equivalent stand-alonerack servers, and blades areeasy to slide into a chassis toquickly add processingcapacity or swap out a faultyunit.

Redundant hardwarecomponents can include: Redundant and hot-pluggable

chassis cooling fans

Redundant chassismanagement modules

Standard N-1 redundant hot-plug power supplies

Optional redundant RAM

Redundant storage with hot-plug hard drives

Battery backed-up RAID cache Redundant network interfaces

Redundant hot-plug switchmodules


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Blade Servers


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R E V I E W T H E A V A I L A B L E C O N F I G U R A T I O N

O P T I O N S F O R V A R I O U S F U N C T I O N S setting up a redundant configuration can simply require

installing modules and powering up the system

Or it may require using a management interface toconfigure the redundancy options.

A M O N G T H E M O S T C O M M O N P O I N T S O F F A I L U R E

I N A N Y S E R V E R A R E T H E H A R D D R I V E S

Server Configuration

Options


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ProvidingBackup for

Power,Cooling

Organizations wantinga true high-availability

solution shouldconsider purchasingpower from twodifferent utilitycompanies.

Each blade server enclosure containsmultiple chassis power supplies

Redundancy allows uninterruptedsystem operation if one or more ofthese chassis power supplies fails

Administrators can also configurethe management interface to turn off

server blades based on theorganizations priorities The blade chassis cooling system,

which consists of multiple fanmodules, is an important factor

A well-designed blade chassis willprovide hot-pluggable fans withmore cooling potential than isnecessary for the platform


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Ensuring Redundancy

Well-designed blade servers ensure networkconnection redundancy

Chassis designs also allow installation of dual

Ethernet switch modules that can enable additionalconnectivity or network redundancy and faulttolerance

A distinction between a blade server and others is

that the connection between the NIC or LOM and theinternal ports of the switch module is hardwiredthrough the midplane


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Deciding Where to Invest

As infrastructure grows increasingly integrated andintelligent, companies have an opportunity to changethe architecture of their systems

This way, availability does not depend on every singleprocessor and capacitor, but is also built into databases,interfaces, and applications

Be selective about where to invest in redundancy

Start with the overall system, assess which subsystems arerequired to be highly available, and consider the softwareenvironment as well as the hardware domain


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ABOUT THE AUTHORS

Josh Neland and Franklin Flint are Technology Evangelists for theOEM Solutions group at Dell. You can follow their musings on Twitter@joshneland and @franklinAtDell, and read more of their work athttp://blog.delloem.com/
http://blog.delloem.com/http://blog.delloem.com/http://blog.delloem.com/


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Resources

http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/

http://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-

appliances-program.aspx
http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://content.dell.com/us/en/enterprise/oem-industry-solutions-oem-appliances-program.aspxhttp://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/http://blog.delloem.com/2011/08/article-on-redundancy-written-by-our-dell-oem-technology-strategists-on-intech/

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