[Gluster-users] [SPAM?] read consistency amongst bricks / sync writes
jburnash at knight.com
Tue Apr 19 15:40:10 UTC 2011
I believe that if your volumes are setup as mirrored (as replicated or replicated-distribute) the file will exist on as many bricks as are designated by the number of copies (replica) requested when the volume is created. E.g
volume create NEW-VOLNAME replica 2 NEW-BRICK ...
In the case of the volume being replicated-distribute, if the file is not found on server b, it will make a call to server a to get it, and pass it to the gluster client without it having any knowledge of where it was actually located.
Clear as mud? :-)
James Burnash, Unix Engineering
From: gluster-users-bounces at gluster.org [mailto:gluster-users-bounces at gluster.org] On Behalf Of Vincent Thomasset
Sent: Tuesday, April 19, 2011 11:34 AM
To: gluster-users at gluster.org
Subject: [SPAM?] [Gluster-users] read consistency amongst bricks / sync writes
This is a newbie question as i am relatively new to glusterfs but
I believe the file propagation is asynchronous between the bricks and was
wondering whether a subsequent write to a file and read of that same file could
possibly happen on different bricks, so that the following scenario
- write on brick a
- read on brick b (file not found)
Or, in a different fashion, if it would be possible to force sync
writes across all
bricks (with the obvious performance hit) to avoid the latter scenario ?
This is using glusterfs 3.1.1.
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