Date: Sat, 23 Mar 2002 21:32:26 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Robert Watson <rwatson@freebsd.org> Cc: Willie Viljoen <will@laserfence.net>, freebsd-fs@freebsd.org, freebsd-bugs@freebsd.org Subject: Re: Soft update instability with heavy IO and offboard IDE controller Message-ID: <3C9D64EA.BBE84A89@mindspring.com> References: <Pine.NEB.3.96L.1020323182807.47668I-100000@fledge.watson.org>
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Robert Watson wrote: > On Sat, 23 Mar 2002, Terry Lambert wrote: > > Disable write caching on the drives. THis is a FAQ. > > Hmm. I thought the wc bit should only affect this sort of scenario in the > event that the system was actually powered off; otherwise, the hard disk > can still flush to disk gradually as it. From the description, it seems > the system panics, but power is never removed from the drives. That said, > I wouldn't be surprised if the problem goes away on the basis that this > will substantially change system behavior for performance reasons, hiding > whatever subtle bug it is :-). The drive lies about commiting data to stable storage. This blows away all the hard work soft updates does trying to ensure ordering. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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