[Samba] Re: CTDB + Samba: Tune Read Performance

John H Terpstra jht at samba.org
Fri Jan 30 05:45:06 GMT 2009

On Thursday 29 January 2009 21:40:55 tim clusters wrote:
> On Tue, Jan 27, 2009 at 6:30 PM, tim clusters <tim.clusters at gmail.com>wrote:
> > Hi,
> >
> > I have a two server setup that acts as SMB as well as NFS servers in
> > active/active configuration managed by CTDB(http://ctdb.samba.org/).
> >
> > The write performance is around 100MB/s per client however the read
> > performance is only 0.6MB/s (using Iozone benchmark). I use Windows 2003
> > Server as CIFS client. Sometimes the read performance is good only from
> > one of the CTDB managed Samba servers but not consistent when you restart
> > CTDB + Samba.
> The issue is resolved and was network related. Tcpdump revealed lots of
> retransmission from the server to client owing to improper TcpWindowSize
> value.
> Cheers,
> -Tim


Thanks for reporting that back to the list.  This is useful information for 
others.  Would it be possible to perhaps provide a little more detail? 

John T.

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