Date: Mon, 10 Sep 2007 11:14:45 +0300 From: Danny Braniss <danny@cs.huji.ac.il> To: freebsd-current@FreeBSD.org, hackers@FreeBSD.org Cc: 'cpghost' <cpghost@cordula.ws>, 'Gavin Atkinson' <gavin@FreeBSD.org> Subject: Re: dump problems Message-ID: <E1IUePt-000P2R-RM@cs1.cs.huji.ac.il> In-Reply-To: <E1IUcXc-000NdZ-LH@cs1.cs.huji.ac.il> References: <E1ISdQi-000GkC-4v@cs1.cs.huji.ac.il> <20070904233246.GA2409@epia-2.farid-hajji.net> <E1ISnig-000Nbm-Ep@cs1.cs.huji.ac.il> <043a01c7f202$a7ad0920$f7071b60$@co.uk> <E1IU10R-000MRT-T8@cs1.cs.huji.ac.il> <046801c7f229$a4534510$ecf9cf30$@co.uk> <E1IUcXc-000NdZ-LH@cs1.cs.huji.ac.il>
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> > > > > > the only indication I can see, is that one of the dump procs. is > > > waiting on > > > sbwait, and probably it's some deadlock, which is similar to what I > > > keep > > > seeing here, i'll try now with SCHED_ULE to see if it make a > > > difference. > > > > > > I'm running SCHED_ULE on these already, if your not I guess it's not the > > scheduler? > > > I can get it to 'work' by fiddling with the b flag (blocksize), which still > points to some timming/deadlock problem. > ie: > dump 0abf 64 /some/backup/file /file/to/backup > now works, but > dump 0abf 64 - | restore rbf 64 - > hangs as before. (i don't think the b 64 in restore is needed). ok, it is time to look at the sources, this program has been around since the beginin of time, or at least since Unix V6 :-), and it has been hacked ever since. but now that most of you never heard of 9track tapes, etc, I was wondering if there is a point in hacking at it again. pros: dump/restore has never failed me till now. cons: there are other programs tar/cpio/gtar/etc, but they each have their nits. so here are some questions: - is the readers/writer split realy needed now? my guess it was put in in the old days to get tapes streaming - which is btw, what's not working. - is it/will it be needed for ZFS? [dump is for ufs ...] danny
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