February 24, 20215 yr I have an UnRaid server running for a few weeks now. Every once in a while the UI becomes unavailable (500 Internal Server Error). I can ssh into the machine though and samba still seems to be working. I tried to gather some logs using the diagnostics command and it never returns. I ran top and then pressed 1 to get the CPUs split out. Wait time (wa) on CPU1 is sitting at ~95. All other wa numbers for other CPUs is 0. This is telling me that it has to do with IO somehow. I ran lsof and it never returns either. I'd like to install iostat but I don't know how to do that in this flavor of Linux (tried yum, apt-get, etc). Any posts I check tell me to install using nerd tools. But I don't have access to a UI to be able to do that since the UI is crashed. I can reboot the system, but the crash will occur again so while it's in this state, I'd like to collect as much information as I can. I think this may have to do with an external USB drive that I have connected to the system. It seems to crash most often when I perform a backup to the external drive. I got an email from CloudBerry Backup that the last backup "failed". No other explanation. I looked on the system (the UI was still working at that point) and noticed that the external USB drive was not longer mounted. Could this be a clue? There seems to be a lot of posts about iowait times, but none of them seem to fit with the circumstances I am seeing here. Can anyone suggest what else I should look for? I'm stuck. syslog
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