I have seen *some* similar activity in different machines through the years and it *always* turns out to be a hardware issue. If this machine is particularly old, I would be suspicious of that. Linc Fessenden ________________________________________ From: CentOS [centos-bounces at centos.org] on behalf of m.roth at 5-cent.us [m.roth at 5-cent.us] Sent: Wednesday, December 07, 2016 1:51 PM To: CentOS mailing list Subject: Re: [CentOS] Unusual System State Chris Olson wrote: > Our smallest network of systems has only four computers connected > via Gigabit Ethernet. The oldest and most stable platform is an eight > year old Dell E520 running CentOS 6.8. We often try out applications > on this Dell/CentOS machine before moving them to other systems on our > other networks. > > Last night, one of our users decided to create a single, 228GB home > directory tar archive on an empty, 500GB, external, USB, Ext4 disk > drive. This was obviously a poor decision. The extent of the results > were not obvious until this morning. > > All disk activity had stopped and the system appeared to be hibernation. > A push on the power button usually brings the system back to life, but > in this case, the unlock screen was presented for only three seconds > and then the hibernation mode was resumed. Repeated attempts to log > on were all thwarted due to this behavior. ssh from other systems wasalso > not possible. > > Holding the power button in order to initiate power down did not work > either. The result was the same as a one second press of front panel > power button bringing up the unlock screen for only a short time. We > eventually removed the power cord for five minutes and then restarted > the machine. <snip> Not that this will be of any help, but we, once in a while, will suddenly find a machine unresponsive, and in an undefined state. IIRC, pingable, but can't ssh in, nor is there any response whatsoever to plugging in a keyboard and monitor. Power cycle is the only answer, and there's never anything in the logs. Mostly, those systems are used for very serious scientific computing (as in, no VM, and I've seen loads of > 80). mark _______________________________________________ CentOS mailing list CentOS at centos.org https://lists.centos.org/mailman/listinfo/centos This e-mail and any attachments with it may contain information that is privileged, confidential, and/or proprietary to Sequenom and/or its subsidiaries. If you are not the intended recipient(s), please notify the sender immediately or please send an email to notify at sequenom.com by return e-mail, delete this e-mail with the attachments and destroy any copies. Any unauthorized review, use, disclosure or distribution is prohibited, may be illegal, and may result in civil and/or criminal prosecution to full extent permitted by law.