Date: Tue, 22 Jan 2002 14:34:47 +0500 From: Sergey Gershtein <sg@ur.ru> To: freebsd-stable@FreeBSD.ORG Subject: Strange lock-ups during backup over nfs after adding 1024M RAM Message-ID: <71617262877.20020122143447@ur.ru>
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Hi! Our server runs FreeBSD 4.4-STABLE. Until recently everything was ok, but when we increased the amount of RAM from 1024Mb to 2048Mb strange lock-ups started to happen. All lock-ups happened at night where activity was pretty low. We run backup over nfs nightly, and there is a good chance it is nfs that causes the problem. When the lock-ups happen backup is usually somewhere in the middle and after the server is restarted backup finishes ok. The most strange thing about it is the lock-up itself. The server keeps responding to pings, keyboard is working (it is possible to switch consoles and type, but not log in), there is nothing on console and in any logs, but nothing else (cron, web server, telnet, ftp, etc) is working. Nothing even happens if ctrl-alt-del is pressed on console. After the hard reboot everything works fine until next night. Anyone has any ideas what can cause the problem? I don't think it is hardware problem, since server works fine all the day during heavy load. I suspect that there could be some problem with the amount of memory, maybe kernel (nfs code?) can't handle situation where cache gets too big (say, more than 1Gb)... Any ideas on how to investigate and find the problem will be greatly appreciated! Regards, Sergey Gershtein -- Ural Relcom Ltd, Ekaterinburg, Russia To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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