COMP 3000 Essay 1 2010 Question 3 - Revision history

Abown: added one weakness of windows clusters

2010-11-09T14:33:37Z

added one weakness of windows clusters

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	In general, however, the most popular solution to solve problems that require large throughput would be to construct a cluster model. Most businesses require the reliability of clusters, even though it sacrifices performance; there is no competition to the hight availability of a cluster server as compared to the grid model.[http://www.dba-oracle.com/real_application_clusters_rac_grid/grid_vs_clusters.htm]		In general, however, the most popular solution to solve problems that require large throughput would be to construct a cluster model. Most businesses require the reliability of clusters, even though it sacrifices performance; there is no competition to the hight availability of a cluster server as compared to the grid model.[http://www.dba-oracle.com/real_application_clusters_rac_grid/grid_vs_clusters.htm]

			== Weaknesses of Cluster Computing ==
			Although are strong at duplicating duplicating mainframe capability it does have it's own weaknesses. One such weakness is that adding extra computers to a cluster may not cause the system to run faster. Depending on the type of process required to run there will be no increase in speed and in some cases a decrease in speed. When the a OSEM (Ordered subset expectation–maximization) algorithm or a Katsevich algorithm is run, the ideal number of computer in the cluster is in fact different. In the OSEM algorithm has a linear speed-up for each added node until the 10th node and then has a plateau of speed increase. Whereas the Katsevich algorithm has a linear speed increase until the 16th node added[http://www.cs.uiowa.edu/~jni/publications/2006a%20Tao%20He%20IMSCCS06.pdf]. So depending on the process the clusters can handle the operation better or worse.

	== Conclusion ==		== Conclusion ==
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	<http://searchcio-midmarket.techtarget.com/sDefinition/0,,sid183_gci213140,00.html>		<http://searchcio-midmarket.techtarget.com/sDefinition/0,,sid183_gci213140,00.html>

			=== Weaknesses of Cluster Computing ===
			Tao He, Jun Ni and Ge Wang,"A Heterogeneous Windows Cluster System for Medical Image Reconstruction",Proceedings of the 35th annual ACM/IEEE international symposium on Microarchitecture, IEEE, 2008, http://www.cs.uiowa.edu/~jni/publications/2006a%20Tao%20He%20IMSCCS06.pdf, (2010-11-09)

Soma: Unprotected "COMP 3000 Essay 1 2010 Question 3"

2010-11-08T15:32:46Z

Unprotected "COMP 3000 Essay 1 2010 Question 3"

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Soma: /* Answer */

2010-10-17T17:04:01Z

Answer

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	=Answer=		=Answer=

			'''This essay does a good job of discussing how Windows provides mainframe-class capabilities; it does not do a good job of addressing where it falls short. --Anil'''

	Throughout the years, Windows has undergone some rather radical changes by modernizing existing technologies and providing innovation to existing features; this resulted in having functionality equivalent to that of a mainframe computer. However, although these changes have been extensive, Windows has not been particularly dominant when it comes to replacing modern mainframe systems.		Throughout the years, Windows has undergone some rather radical changes by modernizing existing technologies and providing innovation to existing features; this resulted in having functionality equivalent to that of a mainframe computer. However, although these changes have been extensive, Windows has not been particularly dominant when it comes to replacing modern mainframe systems.

Soma: /* Backwards-Compatibility */

2010-10-17T17:01:28Z

Backwards-Compatibility

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	== Backwards-Compatibility ==		== Backwards-Compatibility ==
	Backwards-compatibility means that the newer software version can recognize what the old version write and how it work. It is a relationship between the two versions. If the new components provide all the functionality of the old one, we said that the new component is backwards compatible.In computer mainframe era, many applications are backwards compatible.For example,the code written 20 years ago in IBM System/360 can be run in latest mainframe (like zSeries, System/390 family,System z9,etc).This because that models in mainframe computer provide a combination of special hardware,special microcode and an emulation program to simulate the target system.(The IBM 7080 transistorized computer was backward compatible with all models of the IBM 705 vacuum tube computer.) ~~Sometimes mainframe also need customers to halt the computer and download the emulation program.~~		Backwards-compatibility means that the newer software version can recognize what the old version write and how it work. It is a relationship between the two versions. If the new components provide all the functionality of the old one, we said that the new component is backwards compatible.In computer mainframe era, many applications are backwards compatible.For example,the code written 20 years ago in IBM System/360 can be run in latest mainframe (like zSeries, System/390 family,System z9,etc).This because that models in mainframe computer provide a combination of special hardware,special microcode and an emulation program to simulate the target system.(The IBM 7080 transistorized computer was backward compatible with all models of the IBM 705 vacuum tube computer.)

	In Windows OS,one method to implement backwards-compatibility is to add applications.Like Microsoft Windows Application Compatibility Toolkit.This application can make the ~~platfrom~~ to be compatible with most softwares from early version.The second method is the Windows Operating Systems usually have various subsystems.The software originally designed for older version or other OSs can be run in the subsystems.Such as Window NT, it has MS-DOS and Win16 subsystems.~~But Windows 7's backwards-compatibility is not very good.If kernel is different,~~ the ~~OSs~~ can~~'t be compatible with each other.But it doesn't mean that older programs won't run, virtualization will~~ be used to ~~make them~~ run.The third method is to use shims to create the backwards-compatibility.Shims are just like the small libraries that can intercept the API, change parameters passed,handle and redirect the operations. In Windows OS,we can use shims to simulate the behaviors of old version OS for legacy softwares.		In Windows OS,one method to implement backwards-compatibility is to add applications. Like Microsoft Windows Application Compatibility Toolkit.This application can make the platform to be compatible with most softwares from early version.The second method is the Windows Operating Systems usually have various subsystems.The software originally designed for older version or other OSs can be run in the subsystems.Such as Window NT, it has MS-DOS and Win16 subsystems. Virtualization (running an older version of the OS on top of the new one) can also be used to enable old applications to run. (Windows 7 can do this with its virtualized XP subsystem.) The third method is to use shims to create the backwards-compatibility. Shims are just like the small libraries that can intercept the API, change parameters passed,handle and redirect the operations. In Windows OS,we can use shims to simulate the behaviors of old version OS for legacy softwares.

	== I/O and Resource Management ==		== I/O and Resource Management ==

Soma: Protected "COMP 3000 Essay 1 2010 Question 3" ([edit=sysop] (indefinite) [move=sysop] (indefinite))

2010-10-15T13:34:43Z

Protected "COMP 3000 Essay 1 2010 Question 3" ([edit=sysop] (indefinite) [move=sysop] (indefinite))

← Older revision	Revision as of 13:34, 15 October 2010
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Zhangqi: /* Massive Throughput */

2010-10-15T11:55:05Z

Massive Throughput

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	"Mapping the Mainframe to Windows: A Reference Architecture" <http://www.microsoft.com/windowsserver/mainframe/papers.mspx>		"Mapping the Mainframe to Windows: A Reference Architecture" <http://www.microsoft.com/windowsserver/mainframe/papers.mspx>

	=== ~~Massive Throughput~~ ===		=== I/O and Resource Management ===

	"Most Powerful Computers In The World" <http://hubpages.com/hub/Most-Powerful-Computers-In-The-World>		"Most Powerful Computers In The World" <http://hubpages.com/hub/Most-Powerful-Computers-In-The-World>

Zhangqi: /* References */

2010-10-15T11:47:37Z

References

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	"Mapping the Mainframe to Windows: A Reference Architecture" <http://www.microsoft.com/windowsserver/mainframe/papers.mspx>		"Mapping the Mainframe to Windows: A Reference Architecture" <http://www.microsoft.com/windowsserver/mainframe/papers.mspx>

			=== Massive Throughput ===

			"Most Powerful Computers In The World" <http://hubpages.com/hub/Most-Powerful-Computers-In-The-World>

			Windows Server 2003 Administrator’s Companion (MS Press, 2003) "Overview of Microsoft Windows Compute Cluster Server 2003" <http://webcache.googleusercontent.com/search?q=cache:EPlDExBxmDYJ:download.microsoft.com/download/9/e/d/9edcdeab-f1fb-4670-8914-c08c5c6f22a5/HPC_Overview.doc+Windows+Compute+Cluster+Server&cd=1&hl=en&ct=clnk&gl=ca&client=firefox-a>

			"grid computing" <http://searchdatacenter.techtarget.com/definition/grid-computing>

			"Clusters vs. Grids" <http://www.dba-oracle.com/real_application_clusters_rac_grid/grid_vs_clusters.htm>

			<http://publib.boulder.ibm.com/infocenter/tpfhelp/current/index.jsp?topic=/com.ibm.ztpf-ztpfdf.doc_put.cur/gtpc3/c3thru.html>

			<http://searchcio-midmarket.techtarget.com/sDefinition/0,,sid183_gci213140,00.html>

Zhangqi: /* Redunancy */

2010-10-15T11:37:31Z

Redunancy

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	== References ==		== References ==

	=== ~~Redunancy~~ ===		=== Redundancy ===
	"Setup for Failover Clustering and Microsoft Cluster Service" <http://www.vmware.com/pdf/vsphere4/r40/vsp_40_mscs.pdf>		"Setup for Failover Clustering and Microsoft Cluster Service" <http://www.vmware.com/pdf/vsphere4/r40/vsp_40_mscs.pdf>

	""		"Introducing Microsoft Cluster Service (MSCS) in the Windows Server 2003 Family" <http://msdn.microsoft.com/en-us/library/ms952401.aspx>

	=== No downtime upgrades ===		=== No downtime upgrades ===
	Davis, David. "VMware vSphere hot-add RAM and hot-plug CPU." TechTarget. N.p., 09.15.2009. Web. 14 Oct 2010. <http://searchvmware.techtarget.com/tip/0,289483,sid179_gci1367631_mem1,00.html>.		Davis, David. "VMware vSphere hot-add RAM and hot-plug CPU." TechTarget. N.p., 09.15.2009. Web. 14 Oct 2010. <http://searchvmware.techtarget.com/tip/0,289483,sid179_gci1367631_mem1,00.html>.

Zhangqi: /* References */

2010-10-15T11:35:34Z

References

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	== References ==		== References ==

			=== Redunancy ===
			"Setup for Failover Clustering and Microsoft Cluster Service" <http://www.vmware.com/pdf/vsphere4/r40/vsp_40_mscs.pdf>

			""
	=== No downtime upgrades ===		=== No downtime upgrades ===
	Davis, David. "VMware vSphere hot-add RAM and hot-plug CPU." TechTarget. N.p., 09.15.2009. Web. 14 Oct 2010. <http://searchvmware.techtarget.com/tip/0,289483,sid179_gci1367631_mem1,00.html>.		Davis, David. "VMware vSphere hot-add RAM and hot-plug CPU." TechTarget. N.p., 09.15.2009. Web. 14 Oct 2010. <http://searchvmware.techtarget.com/tip/0,289483,sid179_gci1367631_mem1,00.html>.

Zhangqi: /* Backwards-Compatibility */

2010-10-15T11:31:36Z

Backwards-Compatibility

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	=== Backwards-Compatibility ===		=== Backwards-Compatibility ===

	"Windows 7 To Break Backwards Compatibility" http://www.windows7news.com/2008/05/23/windows-7-to-break-backwards-compatibility/		"Windows 7 To Break Backwards Compatibility" <http://www.windows7news.com/2008/05/23/windows-7-to-break-backwards-compatibility/>

	"Mainframe computers" http://computersight.com/computers/mainframe-computers/		"Mainframe computers" <http://computersight.com/computers/mainframe-computers/>

	"Mainframe Features" http://www.scribd.com/doc/6895677/Mainframe-Features		"Mainframe Features" <http://www.scribd.com/doc/6895677/Mainframe-Features>

			"Mapping the Mainframe to Windows: A Reference Architecture" <http://www.microsoft.com/windowsserver/mainframe/papers.mspx>