Re: [Gluster-devel] AFR between two bricks over 3000 miles

[nathan]

On Sat, 1 Mar 2008, Krishna Srinivas wrote:

> Nathan,
>
> Check the performance by bringing writebehind into the picture your
> config file shows that WB and iocache translators are not being used.

Sorry, that was stupid, changed it to subvolumes nyc sjc_write-behind that 
changed the delay to real    0m53.005s, still a far cry from .03 I get 
local. This is only 748K, so I would expect it to write local and write 
behind the 800K to the remote site.

> On Sat, Mar 1, 2008 at 8:48 AM,  <address@hidden> wrote:
> >  /etc/sysconfig is only 748K
> >  cp /etc/sysconfig to /share/mirror took real    0m55.319s
> >  cp /etc/sysconfig to /share took real    0m0.030s
> >
> >  I expected it to be much faster. :)
> >
> >  # Client
> >  volume nyc
> >    type protocol/client
> >    option transport-type tcp/client
> >    option remote-host 10.11.0.1
> >    option remote-subvolume nyc
> >  end-volume
> >
> >  volume sjc
> >    type protocol/client
> >    option transport-type tcp/client
> >    option remote-host 10.12.0.1
> >    option remote-subvolume sjc
> >  end-volume
> >
> >  volume sjc_iocache
> >    type performance/io-cache
> >    option page-size 256KB
> >    option page-count 2
> >    subvolumes sjc
> >  end-volume
> >
> >  volume sjc_write-behind
> >    type performance/write-behind
> >    option aggregate-size 1MB
> >    option flush-behind on
> >    subvolumes sjc_iocache
> >  end-volume
> >
> >  volume mirror
> >    type cluster/afr
> >    subvolumes nyc sjc
> >  end-volume
> >
> >
> >
> > ><>
> >  Nathan Stratton
> >  nathan at robotics.net
> >  http://www.robotics.net
> >
> >
> >
> >  On Thu, 28 Feb 2008, Anand Avati wrote:
> >
> > > on the client. you also might want to put this write-behind + io-cache pair
> > > in the subvolume path of afr which leads towards the remote site alone. Also
> > > make sure afr does not have the remote site as the first subvolume, and has
> > > the option read-subvolume <local-volume> so that reads are not scheduled to
> > > the remote site.
> > >
> > > avati
> > >
> > > 2008/2/28, address@hidden <address@hidden>:
> > >>
> > >>
> > >> On Thu, 28 Feb 2008, Anand Avati wrote:
> > >>
> > >>> using a combination of write-behind with io-threads (with option
> > >>> flush-behind on) prevents the wait of upto N-MB of data (where N is
> > >> 'option
> > >>> cache-size NMB' of io-threads)
> > >>
> > >>
> > >> Client and server are on each host, should I do this on the client or
> > >> server?
> > >>
> > >> -Nathan
> > >>
> > >
> > >
> > >
> > > --
> > > If I traveled to the end of the rainbow
> > > As Dame Fortune did intend,
> > > Murphy would be there to tell me
> > > The pot's at the other end.
> > >
> >
> >
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