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
  alaric AT caerllewys DOT net   alaric AT metrocast DOT net   phil AT 
co.ordinate DOT org
         Renaissance Man, Unix ronin, Perl hacker, Free Stater
                 It's not the years, it's the mileage.

------------------------------------------------------------------------------
_______________________________________________
Bacula-users mailing list
Bacula-users AT lists.sourceforge DOT net
https://lists.sourceforge.net/lists/listinfo/bacula-users