Date: Thu, 27 Nov 2008 01:18:47 +0200 From: Manolis Kiagias <sonic2000gr@gmail.com> To: Rick Janssen <Rick.Janssen@phil.uu.nl> Cc: freebsd-questions@freebsd.org Subject: Re: Filesystem problems at boot and shutdown? Message-ID: <492DD957.9050407@gmail.com> In-Reply-To: <5ddbef2ccbae93c798cde8fd35544dc7.squirrel@webmail-students.phil.uu.nl> References: <5ddbef2ccbae93c798cde8fd35544dc7.squirrel@webmail-students.phil.uu.nl>
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Rick Janssen wrote: > I've been playing around with FreeBSD for some time now, still being > unable to solve some problems. Let me explain. > > I'm trying to run a webserver on the machine. Just basic, nothing too > fancy. Problem concerns the following: The website served is speedy as > expected when accessed from local LAN, but when accessed from WAN via > router, it's realy slow. So, to do some tests, this afternoon I requested > some pages from an computer outside my LAN. Server was very slow again, > even ssh slowed to a crawl. Suddenly, without reason I know off, > everything sped up. I issued a reboot to check if the problem might have > been 'solved'. This took a long time. > > Back home I checked the logs. It now appeared the long reboot-time was > caused by a Syncing disk anomaly, which happens when the system prepares > for shutting down. > > Nov 26 22:38:12 server kernel: Syncing disks, vnodes remaining...1 1 1 1 1 > 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 > 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 timed out > Nov 26 22:38:12 server kernel: Waiting (max 60 seconds) for system process > `bufdaemon' to stop...done > Nov 26 22:38:12 server kernel: Syncing disks, buffers remaining... 184 185 > 186 1 185 185 185 185 184 184 185 185 185 184 184 185 1 184 184 184 184 > 185 185 185 1 184 184 184 184 184 185 184 184 185 185 1 185 184 184 184 > 184 184 184 1 185 184 184 184 184 185 184 184 185 1 185 184 184 184 184 > 184 184 185 1 184 184 185 184 184 184 184 185 184 184 185 1 185 185 184 > 184 184 185 184 184 184 185 1 184 184 185 184 184 185 184 184 185 185 184 > 184 184 184 184 1 184 184 184 1 184 184 185 1 185 184 184 1 184 185 184 > 184 185 185 184 184 ... etc etc... > Nov 26 22:38:12 server kernel: Final sync complete > > So I figured, might as well run fschk -y in single user mode to fix > potential problems. Now I got some new errors: > > Nov 26 20:48:11 server kernel: ad4: WARNING - WRITE_DMA48 UDMA ICRC error > (retrying request) LBA=1364750271 > Nov 26 20:48:11 server kernel: ad4: FAILURE - WRITE_DMA48 > status=51<READY,DSC,ERROR> error=4<ABORTED> LBA=1364750271 > Nov 26 20:48:11 server kernel: > g_vfs_done():ad4s1g[WRITE(offset=682932174848, length=131072)]error = 5 > > So far, nothing serious has followed from these errors I know off. They > only happen sporadically, during reboots. > > Are these to problems even related, or am I just unlucky? Anyone has some > suggestions to fix them? > > Regards, > Rick > > Unless there is some incompatibility between FreeBSD -> Your disk controller -> Your disk, my best guess is you have a failing disk. I would also suggest you check cables, connections (I guess this is an ATA disk so you may wish the check whether the flat cable is the 80-conductor type and is plugged in correctly). Hopefully, if you are just playing with the system, you don't have any critical data in there, otherwise I would suggest you back up immediately. Do you have a spare disk to try and see what happens? Whether your other problem depends on this: It could be, since your webserver might be trying to read from a faulty area and keep retrying. Or indeed there is some incompatibility and the disk is constantly under-performing. You did not mention the speed of you WAN connection, but FWIW I am running a webserver behind a 1Mbps/256Kbps ADSL line and response is good enough. SSH is definitely good enough to use in long vi sessions, with lengthy documents.
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