On 27 October 2015 at 08:06, Stefan Michael Guenther <s.guenther@xxxxxxxxx> wrote:
But I learned from the mailing list, that this is a common message and that I shouldn't me concerned about it.
But the problem is, when I copy a 1.2 GB file from /root to /mnt (gluster volume mounted via nfs) this takes more than 24 seconds. Copying the same file to /tmp takes less than one second, according to the time command.
Hi Stefan, a bit more information on your setup would be useful
- Brick topology - replica 3? distributed?
- Node hardware (Mem/CPU)
- Node hardware (Mem/CPU)
- Network Setup (Number of cards per node, speed)
But assuming a replica 3 setup a 1GB ethernet then the numbers are close to what you would expect. When you copy a file to the mount it is simultaneously copied to the other two bricks over the network connection. Copying 1.2 GB over 1G ethernet takes approx 10 seconds, and you are copying it to two other bricks, so 20 seconds total. And that assumes the network isn't loaded with other demands.
With std 1Gb Ethernet, your limiting factor will be your network speed.
Also, Gluster 3.2 is pretty old and no longer getting updates, you might want to consider upgrading to 3.5, 3.6 or 3.7 :) I believe its a tricky upgrade, so don't rush into it.
--
Lindsay
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