Difference: AdministrativeSinglePrimaryCluster (8 vs. 9)

Revision 92012-08-11 - WilliamSeligman

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META TOPICPARENT	name="Computing"

Nevis particle-physics administrative cluster

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- If a virtual server had its security broken, it could be quickly replaced by a older, un-hacked copy of that virtual machine.
- If a virtual server required a complicated, time-consuming upgrade, a copy could be upgraded instead, then quickly swapped with minimal interruption.

Changed:

<
< The price to be paid for all this sophistication is an increase in complexity. This page (and its companion page on the detailed Corosync configuration) are an attempt to explain the details.

>
> The price to be paid for all this sophistication is an increase in complexity. This page (and its companion page on the detailed corosync configuration) are an attempt to explain the details.

Configuration

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Most of the resources are controlled by scripts provided as part of the Pacemaker/Corosync package. The resources that begin with lsb:: (Linux standard base) are controlled by the standard scripts found in /etc/init.d/ on most Linux systems.

Changed:

<
< The entire configuration is spelled out in (excruciating?) detail on a separate Corosync configuration page.

>
> The entire configuration is spelled out in (excruciating?) detail on a separate corosync configuration page.

Services controlled by corosync:

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http://toic.org/2008/09/22/preventing-ip-conflicts-in-xen/

META FILEATTACHMENT	attachment="HAServersSketch.jpg" attr="h" comment="A sketch of the disk organization of the high-availability servers." date="1285871312" name="HAServersSketch.jpg" path="HAServersSketch.jpg" size="56520" user="WilliamSeligman" version="2"

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>
>

META TOPICMOVED	by="WilliamSeligman" date="1344651041" from="Nevis.AdministrativeCluster" to="Nevis.AdministrativeSinglePrimaryCluster"

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