Date: Wed, 01 Oct 2003 06:39:47 +0000 From: Jens Rehsack <rehsack@liwing.de> To: Kevin Oberman <oberman@es.net> Cc: freebsd-current@freebsd.org Subject: Re: Improvements to fsck performance in -current ...? Message-ID: <3F7A76B3.6080508@liwing.de> In-Reply-To: <20030930221148.54E7E5D07@ptavv.es.net> References: <20030930221148.54E7E5D07@ptavv.es.net>
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Kevin Oberman wrote: [...] > Current has two major changes re speeding up fsck. > > The most significant is the background operation of fsck on file > system with soft updates enabled. Because of the way softupdates > works, you are assured of metadata consistency on reboot, so the file > systems can be mounted and used immediately with fsck started up in > the background about a minute after the system comes up. Be careful what you promise :-) Most new disks have an own disk cache and some of them have a write cache enabled. In case of a hardware failure (or power failure) this data may get lost and the disk's metadata isn't consistent. It's only when no write cache below the system is active. Jens
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