Date: Mon, 9 Jul 2007 12:45:31 +0200 From: Ulf Lilleengen <lulf@stud.ntnu.no> To: Fluffles <etc@fluffles.net> Cc: freebsd-current@freebsd.org, freebsd-geom@freebsd.org Subject: Re: Patches for updated gvinum Message-ID: <20070709104531.GA18511@stud.ntnu.no> In-Reply-To: <46920754.6080901@fluffles.net> References: <20070709092252.GA7809@stud.ntnu.no> <46920754.6080901@fluffles.net>
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On man, jul 09, 2007 at 12:00:52 +0200, Fluffles wrote: > Ulf Lilleengen wrote: > >Hi, > > > >Gvinum just got better. At least, that's what I hope. Lukas rewrote gvinum > >to > >use a simpler and easier to handle single-thread event system, and I have > >been > >adapting existing code to this. The result can be found in the patches > >here: > > > > Nice to see gvinum get's the facelift it so desperately needed. It's > unfortunate gvinum was never able to recover from the GEOM-age, until > now maybe. :-) > > However, do you think that it's performance is affected too? Last time i > tested, i was not impressed with gvinum's RAID5 performance, write > speeds were very low. RAID0 and RAID1 appeared to be on par with gstripe > and gmirror though. I guess gvinum is primary for people who feel > comfortable with its configuration and user-interface. > It might, since it won't have pass BIOs through the consumer/provider system. I did benchmark it a bit with gmirror with rawio, and gvinum was a bit faster. I did a test on another system that showed gmirror a bit faster, so I guess they're still the same. I'll try make a comparison with old gvinum as well. I heard about the RAID-5 problems, but I do not think that will be any better, as the problem was related to the request ordering or at least the way RAID-5 is done(I can't remember exactly, since it's in an old mailbox). However, this seems to be a good tip on what I can look into next after my stability testing. As you say, gvinum is primary for the people who like the complete "volume-manager" it offers. Also, what is important, is that people can upgrade old boxes running vinum. > >Therefore, I hope many will > >test this patch and help discovering bugs that otherwise would just stay > >there. > > > > I will be able to test this on my new test system, coming Wedsnesday. > This consists of a modern dualcore AMD 3GHz processor with 4GB RAM and 8 > SATA disks. If you like, i can report my findings to the list when i'm done. > Yes, that would be nice. Thank you very much, I appreciate your help! Currently, I only have 6 "old" SCSI disks to run my real-world tests on. -- Ulf Lilleengen
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