Date: Tue, 13 Feb 2007 12:19:52 -0800 From: Julian Elischer <julian@elischer.org> To: Eric Anderson <anderson@freebsd.org> Cc: freebsd-fs@freebsd.org, Ivan Voras <ivoras@fer.hr> Subject: Re: UFS2 with SAN Message-ID: <45D21D68.5030503@elischer.org> In-Reply-To: <45D21A82.7000900@freebsd.org> References: <45CD6FF5.8070007@freebsd.org> <20070213075627.63126.qmail@web34502.mail.mud.yahoo.com> <6FC9F9894A9F8C49A722CF9F2132FC2204C9DAB4@ms05.mailstreet2003.net> <a969fbd10702130839j727d055bu10c3ec80e38d2a3d@mail.gmail.com> <6FC9F9894A9F8C49A722CF9F2132FC2204C9DAB5@ms05.mailstreet2003.net> <6FC9F9894A9F8C49A722CF9F2132FC2204C9DAB6@ms05.mailstreet2003.net> <45D1F30A.6080403@freebsd.org> <eqsut3$6a3$1@sea.gmane.org> <45D20037.1040102@freebsd.org> <45D20DA0.4050600@elischer.org> <45D21A82.7000900@freebsd.org>
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Eric Anderson wrote: > On 02/13/07 13:12, Julian Elischer wrote: >> Eric Anderson wrote: >>> On 02/13/07 12:09, Ivan Voras wrote: >>>> Eric Anderson wrote: >>>> >>>>> You might look at tdfs (fuse module from Ivan Voras I believe). It's >>>>> probably horribly beta (not knocking it Ivan - I'm sure it's an >>>>> amazing >>>>> start), so lots of testing would need to be done. It's also most >>>>> likely >>>>> not high performance. >>>> Yes, I'm realistic about it - it is "horribly beta" :) >>>> >>>> Two reasons: one: I couldn't amass enough interested parties to help >>>> test it (and possibly work on it), and second: while it's a nice >>>> problem >>>> to tackle, I don't [yet] need it that badly to start working on it >>>> outside of free time). In any case, TDFS doesn't have locking because >>>> FUSE doesn't have it (or didn't when I started doing it), so it stays >>>> single-writer-multiple-readers until that changes. >>>> >>>> I'm thinking of re-creating it in kernel mode (and in this form it >>>> could >>>> also have locking) but not any time soon. Maybe during the summer (SoC? >>>> probably.). >>>> >>> >>> I've thought about this too - and even thought about making it a file >>> system layer, like nullfs, with a network-kernel piece to notify the >>> readers of changes, etc. I'm not certain if it would work or not.. >> >> it will be very interesting to see the outcome from Matt's cluster >> filesystem on Dragonfly. > > > Is it actually being developed? Last I checked, there was talk, but no > code.. :( He's doing all the underlying stuff. for example he has done a lot in the VFS layer to get ready for it.. (e.g. cache coherency support). > > > Eric
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