Date: Tue, 04 May 2010 03:26:27 -0600 From: "Erich Jenkins, Fuujin Group Ltd" <erich@fuujingroup.com> To: yuwen@exodus.cs.ccu.edu.tw Cc: freebsd-fs <freebsd-fs@freebsd.org>, lab <lab@cs.ccu.edu.tw> Subject: Re: Struggling on NFS problem Message-ID: <4BDFE843.7050600@fuujingroup.com> In-Reply-To: <1272960060.34062.yuwen@exodus.cs.ccu.edu.tw> References: <1272960060.34062.yuwen@exodus.cs.ccu.edu.tw>
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Cheng-Lin Yang wrote: > Dear all, > Currently, we have a NFS server which runs FreeBSD8 with ZFS and few workstations as NFS client (2 * FreeBSD8 amd64 + 1 * FreeBSD7.2 i386 + 2 * Fedora + Debian). We spotted that NFS performs weirdly on FreeBSD clients, which will significantly slow down the system response. The only solution to it is to reboot the clients (Linux client runs smoothly). So we try to use "nfsstat -c" on FreeBSD client to dig into the problem and found strange result (http://pastebin.com/K71qpEDG) : > csie0[~]# nfsstat -c > Client Info: > Rpc Counts: > Getattr Setattr Lookup Readlink Read Write Create Remove > 3595047 75100 1089213 1095 1258311 48664374 104346 116376 > Rename Link Symlink Mkdir Rmdir Readdir RdirPlus Access > 17621 1644 77 19569 9459 45177 0 323665 > Mknod Fsstat Fsinfo PathConf Commit > 0 111262 3 0 590876 > Rpc Info: > TimedOut Invalid X Replies Retries Requests > 0 0 0 0 56022746 > Cache Info: > Attr Hits Misses Lkup Hits Misses BioR Hits Misses BioW Hits Misses > 198414412 3595052 112100649 1088903 62793893 1253320 -1008715 48664379 > BioRLHits Misses BioD Hits Misses DirE Hits Misses > 3751 1095 204326 45191 109194 8 > > As you can see, the value of "BioW Hits" is a negative number. Shouldn't it be equal or larger than zero? We have totally no idea on this issue. Please kindly help us on investigating the problem. Any suggestion is extremely welcomed. Thank you. > > Regards, > George > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" Cheng-Lin Could you provide a bit more info about your system and setup? How much RAM, what type of raidz config? Do you have a separate ZIL device like a solid state drive? Often, you'll experience severe NFS performance degradation when using raidz and nfs if the zil logs are on the same drives as the raidz volume. Erich M. Jenkins Fuujin Group Limited "You should never, never doubt what no one is sure about." -- Gene Wilder
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