[gpfsug-discuss] NDS in Two Site scenario

[Jonathan Buzzard]

On 20/07/16 22:15, Ken Hill wrote:

[SNIP]

> You can further isolate failure by increasing quorum (odd numbers).
>
> The way quorum works is: The majority of the quorum nodes need to be up
> to survive an outage.
>
> - With 3 quorum nodes you can have 1 quorum node failures and continue
> filesystem operations.
> - With 5 quorum nodes you can have 2 quorum node failures and continue
> filesystem operations.
> - With 7 quorum nodes you can have 3 quorum node failures and continue
> filesystem operations.
> - etc
>

The alternative is a tiebreaker disk to prevent split brain clusters.

JAB.

-- 
Jonathan A. Buzzard                 Email: jonathan (at) buzzard.me.uk
Fife, United Kingdom.