What is the fine-grained topic of the following text: A ZFS Pool will become suspended due to IO errors that faults the vdevs to the point where there are insufficient replicas and the zpool can no longer service IO requests; eg: a single vdev pool encounters a vdev failure, more than two vdevs within a RAIDZ1 fail, or both sides of a mirror fail. Only return the topic.
Suspension of a ZFS Pool due to IO errors