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@ -91,6 +91,23 @@ The Linux kernel prior to 3.2 had a multitude of problems with IPv6 implementati
Use at least a 10 GB network, if possible. 1 Gb will also work, but it will be much worse for patching replicas with tens of terabytes of data, or for processing distributed queries with a large amount of intermediate data.
## Hypervisor configuration
If you are using OpenStack, set
```
cpu_mode=host-passthrough
```
in nova.conf.
If you are using libvirt, set
```
<cpu mode='host-passthrough'/>
```
in XML configuration.
This is important for ClickHouse to be able to get correct information with `cpuid` instruction.
Otherwise you may get `Illegal instruction` crashes when hypervisor is run on old CPU models.
## ZooKeeper {#zookeeper}
You are probably already using ZooKeeper for other purposes. You can use the same installation of ZooKeeper, if it isn’t already overloaded.