Date: Wed, 31 Dec 2008 11:23:54 +0100 From: Bernard Dugas <bernard@dugas-family.org> To: usleepless@gmail.com Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: Optimising NFS for system files Message-ID: <495B483A.4080408@dugas-family.org> In-Reply-To: <495B2A4B.8010002@gmail.com> References: <20081216094719.EDCEE1065675@hub.freebsd.org> <495930E4.1030501@dugas-family.org> <20081229230115.F68805@wojtek.tensor.gdynia.pl> <4959DFEF.5090407@dugas-family.org> <20081230150507.U87347@wojtek.tensor.gdynia.pl> <495A3957.9050002@dugas-family.org> <495A3C72.5070802@unsane.co.uk> <20081230201351.L12391@wojtek.tensor.gdynia.pl> <495A9595.6080201@dugas-family.org> <20081231002557.D45571@wojtek.tensor.gdynia.pl> <495B2516.4020904@dugas-family.org> <495B2A4B.8010002@gmail.com>
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usleep wrote: > - Second installation > - FreeNAS, RAID0 > - Tested throughput ( to local RAID0 ): > - ftp: 82MB/s > - nfs: 75MB/s > - cifs/samba: 42MB/s Thanks a lot for these clear references ! > Test issues ( things that get you confused ) > - if you expect to be able to copy a file at Gigabit speeds, you > need to be able to write as fast to your local disk as well. So to > reliable test SAN/NAS performance at Gigabit speeds you need RAID at > the server and at the client. Or write to /dev/null This is what i did with the tar. What function do you use for testing ? > - if you repeatedly test with the same file, it will get cached into > memory of the NAS. so you won't be testing troughput > disk->network->disk anymore: you are testing > NAS-memory->network->disk. I was testing with > ubuntu-iso's, but with 1GB of memory, ISO's get cached as well. i was fearing that, but it seems that does not happen in my testing, as repeating same test give same result. I don't know why it does not happens... > - if you repeatedly test with the same file, and you have enough > local memory, and you test with nfs or cifs/samba, the file will get > cached locally as well. this results into transfer-speeds to > /dev/null exceeding 100MB/s ( Gigabit speeds ). i have observed > transfer speeds to /dev/null of 400MB/s! I would love to see that behaviour. But it didn't happen neither in my testing :-( > We now have a NAS that performs faster than local disk. ^^^^ Is it the FreeNAS you describe in your testing or a new one ? > We plan to use it run development-virtual-machines on. This is also my target :-) I will have some high density servers (6 independent servers in 1U) and trying to master the freebsd diskless process before... Best regards, -- Bernard DUGAS Mobile +33 615 333 770
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