[Gluster-users] metadata for stat : Should it be identical?
Robert Hajime Lanning
lanning at lanning.cc
Thu Oct 24 20:00:50 UTC 2013
On 10/24/13 12:48, Jay Vyas wrote:
> thanks alex... fair enough;
> but how could metadata for a distributed file possibly vary across a
> cluster? is that expected behaviour.
> I guess it tells you that the metadata for the file is not aquired from
> any single location, but rather its determined and stored and maintained
> separately by different machines, and so if one machines time is off, it
> wont share the same view of the file as others.
> so i guess im wondering if thats a bug ? or maybe a feature and i just
> dont realize it yet :) ?
There is no metadata server. When you look at timestamps in stat, you
are seeing the real stat of the file.
If you have "replica 2" then you have two files. The stat can come from
either one. Mtime will be the modification time of the file referenced
by the time on the server (not the client.)
One of the strengths of GlusterFS is that it does not have the
bottleneck/single point of failure of a single metadata server.
King of the Potato People
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