topic Re: 8 Node cluster with 5 managers in StoreVirtual Storage

8 Node cluster with 5 managers

aur — Tue, 29 Oct 2019 11:27:16 GMT

Hi all,

I'm trying to determine the theory behind how many nodes I can lose in my cluster and still have the data available. I currently have the following:

8 nodes in a single cluster

5 managers are in use

Volumes are configured in Network RAID10.

Any ideas how many nodes I could lose in the cluster before the data/volumes are offline? I always thought that if 2 or more node fail, they will go offline.

Thanks

Re: 8 Node cluster with 5 managers

aur — Tue, 29 Oct 2019 14:26:55 GMT

Don't worry I've managed to work it out

Re: 8 Node cluster with 5 managers

techin — Wed, 30 Oct 2019 06:04:25 GMT

Hi @aur ,

Can you please let me know how you fixed this problem. it'll be helpful. Thanks

Re: 8 Node cluster with 5 managers

aur — Wed, 30 Oct 2019 08:11:22 GMT

No problem,

If you have 8 nodes, you can have all of the even nodes or all of the odd nodes fail without issue. The issue comes when you have a node that fails alongside another.

1,3,5,7 can fail and the volumes will still be online

2,4,6,8 can fail and the volumes will still be online

1,2 or 3,4 or 4,5 ...etc fail and the volumes will go offline, for example.

So when the documentation states half of the cluster can go offline, it is true, but it really depends which nodes are offline (obviously this is RAID10 and not RAID10+1 / RAID10+2).

Hope this helps someone out there.