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In versions 5.1 (ScyllaDB Open Source) and 2022.2 (ScyllaDB Enterprise), we improved ScyllaDB’s performance by removing the rx_queues_count from the mode
condition. As a result, ScyllaDB operates in
sq_split mode instead of the
mq mode (see Seastar Perftune for information about the modes).
If you upgrade from an earlier version of ScyllaDB, your cluster’s existing nodes may use the
while new nodes will use the
sq_split mode. As using different modes across one cluster is not recommended,
you should change the configuration to ensure that the
sq_split mode is used on all nodes.
This section describes how to update the perftune.yaml file to configure the
sq_split mode on all nodes.
The examples below assume that you are using the default locations for storing data and the scylla.yaml file,
and that your NIC is
Backup your old configuration.
sudo mv /etc/scylla.d/cpuset.conf /etc/scylla.d/cpuset.conf.old
sudo mv /etc/scylla.d/perftune.yaml /etc/scylla.d/perftune.yaml.old
Create a new configuration.
sudo scylla_sysconfig_setup --nic eth5 --homedir /var/lib/scylla --confdir /etc/scylla
/etc/scylla.d/cpuset.conf will be generated on the output.
Compare the contents of the newly generated
/etc/scylla.d/cpuset.conf.old you created in step 1.
If they are exactly the same, rename
/etc/scylla.d/perftune.yaml.oldyou created in step 1 back to
/etc/scylla.d/perftune.yamland continue to the next node.
If they are different, move on to the next steps.
sudo systemctl restart scylla-server
Wait for the service to become up and running (similarly to how it is done during a rolling restart). It may take a considerable amount of time before the node is in the UN state due to resharding.
Continue to the next node.