Date: Fri, 18 Apr 2008 13:15:38 -0500 From: "James Snyder" <jbsnyder@gmail.com> To: "Claus Guttesen" <kometen@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: ZFS & Bittorent -> Hang? Message-ID: <33644d3c0804181115v38611102yc48c2e46f30d0bf6@mail.gmail.com> In-Reply-To: <b41c75520804181103p1719810dsdf22a7c151e9f30e@mail.gmail.com> References: <16447331.post@talk.nabble.com> <ft2fsj$7i7$1@ger.gmane.org> <16491496.post@talk.nabble.com> <b41c75520804150244p1f7c9693w180cb3a0d4416e4c@mail.gmail.com> <33644d3c0804151005r17095cb1n33117a8e4d8cc09b@mail.gmail.com> <16763410.post@talk.nabble.com> <b41c75520804181103p1719810dsdf22a7c151e9f30e@mail.gmail.com>
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No problem. I've filed a PR: http://www.freebsd.org/cgi/query-pr.cgi?pr=122888 This doesn't seem to be a volume-of-data thing, not sure if it is related to using raidz or not. I don't have another spare disk in the machine I tested on to pare things down. Otherwise, seems to be pretty stable. I've been knocking on it for some time with no other troubles. Prefetch seems to me to be a little less than ready for prime-time. I seem to recall on a 32-bit machine as well that pkg_delete would run terribly slowly with prefetch on, and things got better when I re-enabled the zil and turned prefetch off. Not sure whether the zil just helped a lot there or if the problem was prefetch. I'm using ZFS on my Mac OS X laptop as well, that's been pretty good too. Latest build (111 on zfs.macosforge.org) has fixed mmap coherency, and a bunch of other things. On Fri, Apr 18, 2008 at 1:03 PM, Claus Guttesen <kometen@gmail.com> wrote: > > OK. I've been able to reproduce the issue. > > > > Conditions: > > - Stock shipped kernel and modules from RELENG 7.0 > > > > loader.conf settings: > > - zfs prefetch enabled > > - zfs zil disabled > > - vm.kmem_size_max="1073741824" > > - vm.kmem_size="1073741824" > > > > AMD64 on Core 2 Duo w/ 4 GB RAM > > > > raidz across 4 disks, using root on zfs (also experienced this hang with zfs > > just on /usr) > > > > How To Reproduce > > - install transmission-daemon, run transmission-daemon (it will daemonize, > > automatically backgrounding) > > - grab a torrent, such as KNOPPIX (http://torrent.unix-ag.uni-kl.de/) > > - transmission-remote -a <torrentfile> (add the torrent) > > - transmission-remote -s all (start all the torrents) > > > > wait hours to a day or so with whatever you want logging things running and > > active since anything that hits disk after the hang will get hung as well > > > > I've just done this twice. It doesn't seem to happen with zil enabled and > > prefetch off. > > > > Expected Behavior > > No hang. > > Thank you for spending time on this. I'm getting some jbod-storage in > a few weeks and will spend some time using various block-sizes and > share partitions across nfs. I'm somewhat confident that zfs on > FreeBSD will work fine but Solaris is (of course) also an option. This > will be approx. 7 TB to begin with and growing upwards to some two > digit TB's. > > What is the largest storage zfs on FreeBSD has been used on? I tried > it for some month on 8 TB. > > -- > > > regards > Claus > > When lenity and cruelty play for a kingdom, > the gentlest gamester is the soonest winner. > > Shakespeare > -- James Snyder Biomedical Engineering Northwestern University jbsnyder@gmail.com
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