Date: Tue, 13 Dec 2011 19:35:15 -0500 (EST) From: Rick Macklem <rmacklem@uoguelph.ca> To: Peter Maloney <peter.maloney@brockmann-consult.de> Cc: freebsd-fs@freebsd.org Subject: Re: FreeBSD 9.0 and NFS async Message-ID: <466034446.173998.1323822915962.JavaMail.root@erie.cs.uoguelph.ca> In-Reply-To: <4EE77C81.1060807@brockmann-consult.de>
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Peter Maloney wrote: > On 12/13/2011 05:18 PM, Johan Hendriks wrote: > > Rick Macklem schreef: > >> Johan Hendriks wrote: > >>> Hello all. > >>> > >>> I used to use async on my 8.x nfs servers! > >>> On the FreeBSD 9.0 server i can not do it through the old 8.x > >>> sysctl. > >>> > >>> Is there an other way to set async on FreeBSD 9.x > >>> > >> You have two choices: > >> 1 - Apply this patch to your NFS server's kernel sources and then > >> set > >> vfs.nfsd.async=1 > >> http://people.freebsd.org/~rmacklem/async.patch > >> > >> 2 - switch to using the old server by setting > >> oldnfs_server_enable="YES" > >> in your /etc/rc.conf and then setting the sysctl. > >> > >> I'll assume that you realize that doing this violates the NFS RFCs > >> because > >> it runs your server in a way where there is a risk of data loss > >> (that > >> the > >> client won't know to re-write) when the server crashes. > >> > >> rick > >>> regards, > >>> Johan Hendriks > >>> _______________________________________________ > >>> 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" > > Yes i do know the risk. > > > > The thing is we want a dataset shared to a ESXi client using NFS. > > I use NFS for my normal usage, (sharing ports tree and so on.) but > > now > > we want to use it to share a ZFS dataset for a ESXi client. > > We use iscsi now, but this way we miss some zfs goodies. like > > snapshots(not a zvol) and most important, we can reach the files > > directly. > > > > But with a virtual machine shared over NFS i get horrible > > performance. > > If i copy a file to whatever virtual machine from a windows client > > shared with iscsi , i get arround 80Mb per second (in the windows > > copy > > window) almost at a steady pace. we are really pleased with that. !! > > If i copy a virtual machine to the NFS share, fire it up, and do a > > file copy, it never gets higher than 50 Mb and it sometimes drop to > > 1 > > Mb then goes to 20 back to 10 and so on. > > Also the machines feels sluggish in performance. > > > That is interesting. I am doing the same thing (and settling for the > horrible 5-9MB/s writes right now with a decent ZIL that goes 65 MB/s > with any other NFS sync client). But without any NFS settings, I found > I > can simply run: > # zfs set sync=disabled tank/esxidatasetname > with the same file integrity sacrifice Rick mentions above. > > I found that > vfs.nfsd.async=1 > doesn't actually do anything for me (8.2-STABLE Sept 29th). This sysctl won't exist unless you apply the patch (that isn't even in head yet). For FreeBSD8.n, the default server is the old one and vfs.nfsrv.async=1 would be the sysctl. (If that was what you meant, then don't worry about the above comments, rick) > > > Are there other less dangerous things i can try to boost > > performance? > > > > regards, > > Johan Hendriks > > > > > > > > > > > > > > > > _______________________________________________ > > 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" > > > -- > > -------------------------------------------- > Peter Maloney > Brockmann Consult > Max-Planck-Str. 2 > 21502 Geesthacht > Germany > Tel: +49 4152 889 300 > Fax: +49 4152 889 333 > E-mail: peter.maloney@brockmann-consult.de > Internet: http://www.brockmann-consult.de > -------------------------------------------- > > _______________________________________________ > 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"
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