Date: Tue, 23 Jul 2002 09:53:14 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: dirkx@covalent.net Cc: krentel@dreamscape.com, peter@wemm.org, freebsd-hackers@FreeBSD.ORG Subject: Re: dump on mounted fs Message-ID: <20020723145314.GE82383@dan.emsphone.com> In-Reply-To: <Pine.OSX.4.44.0207211838370.315-100000@mobile.webweaving.org> References: <200207190139.g6J1da517312@dreamscape.com> <Pine.OSX.4.44.0207211838370.315-100000@mobile.webweaving.org>
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In the last episode (Jul 21), dirkx@covalent.net said: > On Thu, 18 Jul 2002, Mark W. Krentel wrote: > > > Dump on a live FS is always risky. FreeBSD in 4.x and earlier > > > will have up to about a 30 second delay before a write() makes it > > > to physical disk. > > Is this regardless of the sync(8) command used ? And if so - what > does sync(8) actually sync - and which things are taking longer to > sync ? On a softupdates-mounted filesytem, all sync does is speed up the block-flushing clock a bit, I believe. It doesn't guarantee that unwritten data is flushed before the call returns. -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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