Performance Issues on 6.3

Mel fbsd.questions at rachie.is-a-geek.net
Wed Feb 27 18:25:12 UTC 2008


On Wednesday 27 February 2008 18:56:15 Natham wrote:
> On Wed, Feb 27, 2008 at 12:26 PM, Lyle Miller <lm101ml at bellsouth.net> wrote:
> > Natham wrote:
> >  > Hi i have a server with four disk atached, 2 raid 0 and 2 raid 1. Im
> >  > getting a low performance on file trasfers  over network to windows
> >  > clients  i get only about 30MB/s. Looking at gstat i got both disk are
> >  > trasfering 15000kBps each over a gigabit connection(client and
> >  > server). How can improve performance for my data server?
> >
> >  i dont know if this will eventually help in your case .....
> >
> >  ... but ....
> >
> >  i noticed a link on www.freebsd.org under 'in the media'
> >
> >  look for 'squeeze your gigabit nic for top performance' dated 2007-10.
> >
> >  gl
>
> Yes, i did everything it recomends. Tahnk you

How to rule out the raid:
1) create a memory disk, in your case I'd go with 256MB if you can spare the 
memory.
2) Put a file on it, size ~210MB (7 * 30MB/s, should give ample time to let 
the transferrate go up)
3) share it via samba
4) Download it through one of the clients

If the transfer rate is still low, it's not the raid. Install a bandwidth 
monitor then (net/bmon for example) and see if the traffic is actually higher 
then the 30MB/s, eating the rest of your bandwidth, investigate samba issues, 
switches, clients (are they really configured Gbit?).

If the transfer rate is much higher, you're pretty safe to assume it's a disk 
issue.

Manpage to read:
mdconfig(8) - choose swap backed btw.
-- 
Mel

Problem with today's modular software: they start with the modules
    and never get to the software part.


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