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Minimum number of nodes, and SSD choice


Ste
125 Posts
March 6, 2020, 5:53 pm

Hello,

I remember the minimum number of nodes to start a cluster was 3, but I deployed my 3 servers and the wizard says I need one host more... Is that number increased to 4 nodes in vers. 2.5 or did I something wrong ? Is it possible to start over again the wizard for a second try ?

Second question: what is better to choose for the NVMe SSD, Journal or Cache device ? As my controller has a write cache my guess is "journal", but I would like a confirm.

Thanks and bye.

Last edited on March 6, 2020, 5:56 pm by Ste · #1

admin
2,930 Posts
March 6, 2020, 6:03 pm

It needs 3.  maybe you get an error deploying the first 2 nodes ?

yes in case you have a controller with cache, you do not need a cache device.

 

#2

Ste
125 Posts
March 6, 2020, 6:13 pm
Quote from admin on March 6, 2020, 6:03 pm

It needs 3.  maybe you get an error deploying the first 2 nodes ?

I'm afraid there was an issue while finalizing node 1. Can I start over ? Is it possible to reset the wizard ?

#3

admin
2,930 Posts
March 6, 2020, 6:17 pm

Yes there shoud be a reset button

#4

Ste
125 Posts
March 6, 2020, 6:53 pm

I can't find it, all the 3 nodes are showing this, even after a reboot:

wizard

#5

admin
2,930 Posts
March 6, 2020, 7:03 pm

this means each completed the deploy. can you look in /opt/petasan/config/cluster_info.json in each node, it should list the nodes that joined  and see which one is missing, in such case you may need to re-install that one.

Last edited on March 6, 2020, 7:03 pm by admin · #6

Ste
125 Posts
March 6, 2020, 8:25 pm

Yes, node 3 has only itself in the management nodes list, I have to reinstall this one.

Thanks

#7