Date: Mon, 26 Aug 1996 14:45:25 -0700 From: David Greenman <dg@root.com> To: Charles Henrich <henrich@crh.cl.msu.edu> Cc: nate@mt.sri.com, freebsd-isp@freebsd.org Subject: Re: Anyone using ccd (FreeBSD disk striper) for news Message-ID: <199608262145.OAA15639@root.com> In-Reply-To: Your message of "Mon, 26 Aug 1996 17:14:16 EDT." <199608262114.RAA13955@crh.cl.msu.edu>
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>In lists.freebsd.isp you write: > >>> > > What I want is a solution which postpones the writes until hell freezes >>> > > over. Or, better yet, doesn't do them at all. >>> > >>> > Use MFS for your news spool partition. :) >>> > >>> > You *have* to write them down sometime unless you have gigabytes of >>> > battery backed memory. >>> >>> Why? >>> >>> Of what practical value or use is writing back data which will never be >>> looked at? > >>Maybe I'm confused, but I see the discussion talking about ATIME writes, >>and normal writes, and there being no distinction made between when you >>are talking about one or the other. > >>> Think about it: if you were to unmount your news spool and remount it -ro, >>> nnrpd would continue to work just fine because NOTHING ever looks at the >>> file atime value (which FFS can't/won't modify if you mount -ro)... and if >>> the only reason you are doing an update is to write back the modified atime, >>> what the hell is the value of doing the write? > >>POSIX compliancy. :) > >Im looking at replacing our news server with a huge FreeBSD system, and was >wondering why not have a fstab options (noatime,nomtime) that disables the >writing of [AM]TIME data? That shouldnt be *too* difficult to add.. I've already written the code. There was a bug that was causing the flag to not be propagated correctly in the kernel that I haven't had time to fix. I'm starting to get interested in this again for wcarchive, so perhaps I'll dig out the changes in the next few days. -DG David Greenman Core-team/Principal Architect, The FreeBSD Project
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