Comments on: HA, primary and secondary nodes?

By: High Availability « UP2V

High Availability « UP2V — Tue, 10 Feb 2009 13:20:36 +0000

[...] http://www.yellow-bricks.com/2008/09/09/ha-primary-and-secondary-nodes/ [...]

By: LucD

LucD — Mon, 15 Dec 2008 20:53:32 +0000

Do you happen to know where (which log) you can see if a re-election has taken place ?

My idea was to use the ReconfigureComputeResource method to force a re-election after a 1 or more host failures.

This could be done like this (PowerShell-VITK)

$clus = Get-View -Id (Get-Cluster ).Id
$clsConfigInfoEx = New-Object VMware.Vim.ClusterConfigSpecEx
$clsConfigInfoEx.DasConfig = $clus.ConfigurationEx.DasConfig
$clsConfigInfoEx.DpmConfig = $clus.ConfigurationEx.DpmConfig
$clsConfigInfoEx.DrsConfig = $clus.ConfigurationEx.DrsConfig
$clsConfigInfoEx.DpmConfig = $clus.ConfigurationEx.DpmConfig

$clus.ReconfigureComputeResource($clsConfigInfoEx, $true)

By: How to check which is your Primary node in HA ? « Lets Design, Implement and do Administration of ESX3

Mon, 22 Sep 2008 13:40:53 +0000

[...] Courtesy: Yellow Bricks [...]

By: Duncan Epping

Duncan Epping — Thu, 11 Sep 2008 19:10:37 +0000

well around once every two months or so…

By: John

John — Thu, 11 Sep 2008 18:38:14 +0000

Duncan, after upgrading to 2.5 U2 and dropping all the old performance data that wasn’t rolling up life seems to be much better. I was about ready to open an SR around it but how often do you really put hosts in M mode?
Thanks for the feedback!

By: Duncan Epping

Duncan Epping — Thu, 11 Sep 2008 13:47:01 +0000

@ Alastair, every node up til 5 becomes primary!

@ Bouke, that’s a great compliment from the Guru that got me enthusiastic about VMware!

By: Bouke Groenescheij

Bouke Groenescheij — Thu, 11 Sep 2008 08:45:56 +0000

As always, excellent and spot-on info! Great job Duncan.

By: Alastair

Alastair — Thu, 11 Sep 2008 01:33:13 +0000

I had understood that the number of primary nodes was the configured host failure number plus one, up to a maximum of five.
i.e. in a ten node cluster with configured failure level of 1 there would be only two primaries.
Does this differ from your understanding?

By: Duncan Epping

Duncan Epping — Wed, 10 Sep 2008 14:24:18 +0000

@chris:
1) that totally depends on the infrastructural design, stuff like network link. I’ve setup both variations and actually don’t have one that I prefer more… I always have the feeling that it’s safer to have 2 clusters, one at each site.
2) try:
“more /opt/LGTOaam512/log/aam_config_util_listnodes.log”
or
“more /var/log/vmware/aam/aam_config_util_listnodes.log”

By: Duncan Epping

Duncan Epping — Wed, 10 Sep 2008 14:20:11 +0000

@ john:
1st question: I would suppose number of nodes in a cluster because all the resource state data needs to go around.
2nd question: this is awkward behavior that I haven’t seen personally. you should definitely check your log files and check for any weird messages regarding this. I would recommend with posting a question on VMTN and phone VMware support. I heard a case like this once and it had to do with zoning on the SAN.
3rd questions: it’s currently not possible to have different ip networks for the SC in the same cluster