Multiple unbound instances

Miguel Miranda miguel.mirandag at
Fri Mar 4 18:22:35 UTC 2016

OK thanks. I have read the performance doc,  So I have two servers that are
serving 250k customers,  it is recommended that I configure 10g for cache
in one instance?  I have 16 cores (with hyper threading) in each one.
Should I configure 8 or 16 threads?
El mar. 4, 2016 10:19 AM, "Andi via Unbound-users" <
unbound-users at> escribió:

> Zitat von Miguel Miranda via Unbound-users <unbound-users at>:
> Hello to all, im installing a load balancer and i want to run multiple
>> unbound instances, im doing this because my it experts says  it is not
>> recommended to have a huge cache (i have 32GB available) it is better to
>> have 2 or 3 GB cache in multiple unbound instances, this is good for high
>> availability too, so if a instances dies the balancer notices it and the
>>  other instances take the load,  what do you think about it ? if this a is
>> a good idea, how to run multiple unbound instances, i am running unbound
>> 1.5.1 Centos 6.7.
>> regards.
> I would not suspect that the cache size would be a limiting factor for
> Unbound. It *can* be problematic if you need a lot of CPU power and
> therefore have a lot (>> 8) of threads using the same cache because of lock
> contention.
> For details have a look here :
> If you need high availability multiple instances will not help that much
> if they use the same kernel and/or the same hardware, so you have to split
> the multiple instances on multiple machines and maybe even different OS.
> Regards
> Andreas
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