On Thu, Jul 14, 2005 at 12:14:49PM -0700, Kevin Oberman wrote.. > > Date: Thu, 14 Jul 2005 20:38:15 +0200 > > From: Anatoliy Dmytriyev <[EMAIL PROTECTED]> > > Sender: [EMAIL PROTECTED] > > > > Hello, everybody! > > > > I have found unusual and dangerous situation with shutdown process: > > I did a copy of 200 GB data on the 870 GB partition (softupdates is > > enabled) by cp command. > > It took a lot of time when I did umount for this partition exactly after > > cp, but procedure finished correctly. > > In case, if I did âshutdown âh(r)â, also exactly after cp, the > > shutdown > > procedure waited for âsyncâ (umounting of the file system) but sync > > process was terminated by timeout, and fsck checked and did correction > > of the file system after boot. > > > > System 5.4-stable, RAM 4GB, processor P-IV 3GHz. > > > > How can I fix it on my system? > > SCSI or ATA? If it's ATA, turn off write cache with (atacontrol(8) or > the sysctl. > > The problem is that disks lie about whether they have actually written > data. If the power goes off before the data is in cache, it's lost. > > I am not sure if write-cache can be turned off on SCSI, but SCSI drives > seem less likely to lie about when the data is actually flushed to the > drive.
At least you can set FUA if you want to force the data onto the platter. -- Wilko Bulte [EMAIL PROTECTED] _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
