A front-end computer for PRM suddenly hung up around 15:05 JST.
It seems a same issue as K1ALS0 on May. 4th (see also klog#33675).
Finally, K1PRM was recovered by power cycles from BMC interface.

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Because there seemed to be no concern about secondary disaster and ITMX measurements were running, I recovered PRM after finishing ITMX measurements around 17:06 JST (see also Fig.1). For restarting PRM front-end, I requested SAFE to all suspensions connected to the Dolphin network. Because there were lots of SDF differences and it's difficult to clear all of them, I rebooted PRM only with taking snapshot of SDF difference windows. Fortunately there was no trouble and I didn't need to use snapshots.