Date: Thu, 8 Jul 2010 10:35:22 +0200 From: Cejka Rudolf <cejkar@fit.vutbr.cz> To: Ken Smith <kensmith@buffalo.edu> Cc: Garrett Wollman <wollman@hergotha.csail.mit.edu>, hubs@freebsd.org Subject: Re: FreeBSD 8.1-RC2 Available... Message-ID: <20100708083522.GA89496@fit.vutbr.cz> In-Reply-To: <1278524349.46615.32.camel@bauer.cse.buffalo.edu> References: <1278081504.83414.26.camel@bauer.cse.buffalo.edu> <201007071732.o67HWPN3034932@hergotha.csail.mit.edu> <1278524349.46615.32.camel@bauer.cse.buffalo.edu>
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Ken Smith wrote (2010/07/07): > On Wed, 2010-07-07 at 13:32 -0400, Garrett Wollman wrote: > > I'm not sure how many months it will take for these to show up on ftp5 > > at the current rate of updates. Presently it takes about two and a > > half weeks just to synchronize all the packages, after which cvsup > > hits some sort of timeout and starts all over again. Did you try to use -Pa option for cvsup? It helped me very much, when I tried to compare speeds of cvsup with and without this option in the past. Speed increased from 50 KB/s to 500 KB/s. I still use this option today and the speed of updates on european ftp-master.eu.FreeBSD.org is sufficient. The mirror is currently synchronized and last bigger update including files FreeBSD-8.1-RC2-amd64-dvd1.iso.gz and FreeBSD-8.1-RC2-i386-dvd1.iso.gz ran under 3 hours. > > (This may be a result of switching to ZFS -- it seems that ZFS is > > about one tenth the speed of UFS2 on the same hardware -- but I > > haven't had time to investigate any more deeply than that. Any ZFS > > experts out there who could suggest a fruitful line of research?) I'm not ZFS expert either, but I have similar experiences and I rather stayed with UFS2. I think that long fsck is not such a big problem for our mirrors and I can see on my 8 x 500 GB HW RAID-5 sequential reads up to 300 MB/s using UFS2, instead of just 30 MB/s using ZFS (tested both over RAID-5 and JBOD). Raidtest showed me similar results too. My understading of ZFS is that it it great FS, when I have many disk subsystems, and I need to build one to many flexible filesystems over them. > As a heads-up switching over to rsync generally is in the works. Great, thanks ;o) I'm the first hungry customer with ftp-master.eu.FreeBSD.org ;o) > The motivation is being able to have files larger than 2Gb. > Pieces of cvsup keep track of file sizes as a signed integer > so max file size is 2^31... The other problems are limited capabilities using IPv6 and I really do not believe in identity of source and destination trees mirrored using cvsup... Regards. -- Rudolf Cejka <cejkar at fit.vutbr.cz> http://www.fit.vutbr.cz/~cejkar Brno University of Technology, Faculty of Information Technology Bozetechova 2, 612 66 Brno, Czech Republic
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