I’ve spent the past several years managing a fleet of several hundred Juniper QFX10000 switches. These have primarily been the QFX10002 fixed switches, but there’s been a few chassis switches in there too. As more and more of these were deployed, I started to notice an increasing number of hardware failures, specifically with the HMC. (HMC stands for “hybrid memory cubes”, which is the memory used by the forwarding plane.)