On 05/05/10 08:38, John Drescher wrote:
>> Sorry my servers are on gigabit links.
>> How do you come to 9MB/s with a 100Mb link, is it not equals to 12,5 MB/s?
>
> Overhead.
>
>> If it's correct on a gigabit link I would have a rate transfer of 90MB/s
>
> You will probably get less than that if you do not use jumbo frames.
>
>> and the transfer rate of the sata disks are 3Gb/s(375MB/s).
>
> No way are your SATA drives that fast. More likely 1/4 to 1/3 of that
> speed unless all servers are using high end SSDs.
That. Always remember that the data transfer rates specified on disk
interfaces are the maximum burst transfer rate FROM a full disk cache or
TO an empty one. The actual sustained rates at which the physical
mechanism can read or write data to and from the platters are FAR lower.
--
Phil Stracchino, CDK#2 DoD#299792458 ICBM: 43.5607, -71.355
ala...@caerllewys.net ala...@metrocast.net p...@co.ordinate.org
Renaissance Man, Unix ronin, Perl hacker, Free Stater
It's not the years, it's the mileage.
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