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

[Krishna Srinivas]

On Sat, Mar 1, 2008 at 11:39 AM, Krishna Srinivas <krishna at zresearch.com> wrote:
> Nathan,
>
>  Check the performance by bringing writebehind into the picture your
>  config file shows that WB and iocache translators are not being used.

As in:

volume mirror
  type cluster/afr
  subvolumes nyc sjc_write-behind
end-volume


>
>  Regards
>  Krishna
>
>
>
>  On Sat, Mar 1, 2008 at 8:48 AM,  <nathan at robotics.net> 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, nathan at robotics.net <nathan at robotics.net>:
>  >  >>
>  >  >>
>  >  >> 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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