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Limitation of a set of 3 CPS

Created: 08 Feb 2013 • Updated: 07 Mar 2013 | 3 comments
This issue has been solved. See solution.

Hi all!

We have installed a set of 3 CPS (in three different sites) to configure IO fencing. We wonder how many clusters can use this set of 3 CPS. In the doc "Veritas™ Cluster Server Administrator's Guide 6.0", I read:

"A single CP server can serve multiple VCS clusters. A common set of CP servers can serve up to 128 VCS clusters."

- 128 clusters.... of how many nodes?? 2,3,...???

In this post , AHerr says that "in testing we have had over 1000 2-node clusters using the same set of 3 CPS nodes". Why the limitation of 128 clusters????

Other question is about the bbdd /etc/VRTScps/db/current/cps_db, what happens if this file is deleted by accident??? Is it correct to use the cps_db file of the others CPS??? (I tried and worked fine) should we backup it up daily???



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arangari's picture

i presume all the 3 CPS servers will act as 3 co-ordination points for set of clusters in your data-center.

AFAIK, The CPS can take up 128 clusters, irrespective of their node-count. i can confirm this though

Thanks and Warm Regards,

Amit Rangari

If this post helped you resolving the issue, please mark it as solution. _____________________________________________________________________________

AHerr's picture

Hi Joaquin,

We are working on an update to the document I/O Fencing Whitepaper that was written for VCS version 5.1SP1.  It should be available by the end of the week.

From a product perspective, if there were no limitations, what would the maximum number of clusters you would configure for a single set of 3 CP Servers? (512, 1024, 2048)?

From a Product Manager perspective, I am curious on your opinion on what the max you would use if there were no limitations.   Of course there are limitations and we are finishing up our recommendations for this update.


joagmv's picture

Hi AHerr,

well, in my job new VCS clusters are being setting up every week, so in less than one month the set of CPS have about 40 clusters registered. We just wondered how many we could register in these CPD and the reason of the limitation of 128 clusters.

In my opinion, a limitation of 128 seems to be just a few clusters due to it is not a big load of network traffic (I do not know if all the nodes have to go to CPS to preempt in the case of troubles... maybe It can be a problem). 

About the /etc/VRTScps/db/current/cps_db, which is the best practice?

I really enjoy reading the VCS whitepapers, they are really useful!