-* The disk on the host must have a maximum P99 write latency of 10 ms. This supports etcd performance and stability. For more information about the disk write latency requirements for etcd, see [Disks](https://etcd.io/docs/latest/op-guide/hardware/#disks) in _Hardware recommendations_ in the etcd documentation. For more information about the 10ms requirement, see [What does the etcd warning “failed to send out heartbeat on time” mean?](https://etcd.io/docs/latest/faq/) in the etcd documentation.
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