Date: Wed, 10 Mar 2004 15:55:54 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: "David E. Cross" <crossd@cs.rpi.edu> Cc: wronkm@cs.rpi.edu Subject: Re: JUFS update, and questions. Message-ID: <Pine.BSF.4.21.0403101546090.15852-100000@InterJet.elischer.org> In-Reply-To: <1078960907.4345.20.camel@kiki.cs.rpi.edu>
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On 10 Mar 2004, David E. Cross wrote: > Journaled UFS Technology Description > [... much good stuff deleted] Not requests for features, just requests as to whether you have considerred these.. Does it have the ability to keep the journal on a separate media? I have sometimes seen the ability to have a separate journal disk used to good effect. (not a system filesystem, but a journalled database). Having a separate journal file/disk elsewhere can speed things up by reducing seeks (and other resiliance advantages). I have also seen double logging and remote logging... each of which of course has advantages and disadvantages.. Remote logging allows the log to be "replayed" at real time in teh remote site, leading to an instantaneously correct remote backup/mirror of the local disk. (of course it can not be safely accessed except with special safety requirements.. (e.g ability to shoot an open vnode if teh inode under it is rewritten) I notice also that you store pre/post stuff and wonder if this can be used in conjunction with soft-update's need to sometimes roll-back things on the disk? julian
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