Optimising NFS for system files
bernard at dugas-family.org
Wed Dec 31 10:22:07 UTC 2008
> - 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
> - 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
> 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
Bernard DUGAS Mobile +33 615 333 770
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