Difference: AdministrativeSinglePrimaryCluster (5 vs. 6)

Revision 62010-10-01 - WilliamSeligman

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META TOPICPARENT name="Computing"

Nevis particle-physics administrative cluster

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 In the 2000's, nevis1 was gradually replaced by many Linux boxes. Administrative services were moved to separate systems, typically one service per box; e.g., there was a mail server, a DNS server, a Samba server, etc. Each working group at Nevis purchased their own server and managed their own disk space. The above issues were resolved:

  • Jobs could be sent to the condor batch system, so that no one system would be slowed down due to a user's jobs.
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  • A single computer system could be restarted without affected most of the rest of the cluster; e.g., if the mail server needed to be rebooted, it didn't affect the physics analysis.
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  • A single computer system could be restarted without affecting most of the rest of the cluster; e.g., if the mail server needed to be rebooted, it didn't affect the physics analysis.
 
  • If a server because compromised, e.g., the web server, the effects could be restricted to that server.

This configuration worked well for a few years, but some issues arose over time:

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  These services are not part of the HA cluster because:
  • in the hopefully unlikely event that the HA cluster needs to be rebooted, it's nice to have the services on hermes still available during the reboot;
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  • it takes a bit of time for the HA cluster to start up after, e.g., a power outage; again, it's nice to have the above services immediately available.
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  • it takes a bit of time for the HA cluster to start up after, e.g., a power outage; again, it's nice to have the above services immediately available.
 

The HA cluster

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 http://www.clusterlabs.org/wiki/Main_Page
http://www.clusterlabs.org/rpm/
http://theclusterguy.clusterlabs.org/post/178680309/configuring-heartbeat-v1-was-so-simple
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http://www.clusterlabs.org/doc/en-US/Pacemaker/1.0/html/Pacemaker_Explained/
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http://www.clusterlabs.org/doc/en-US/Pacemaker/1.0/html/Pacemaker_Explained/
http://www.ourobengr.com/ha
 

DRBD

 
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