- Check alerts in web ui
- Follow journalctl -fa to see anything unusual
- Check ulimit for clients. "ulimit -n" is one practical example
- Do a burn in test: FIO + Small file on a Quobyte mount
- Compare that to your local disks: FIO + Small file on a Quobyte mount on a physical device /var/lib/quobyte/
- Check you network: retransmits, "ecn" enabled in sysctl, ulimit from what we have in our "tuned" performance profiles (especially ...)