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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