Niclas, Distribute-Replicate means that you have 2 sets of mirrors instead of just one. Gluster will distribute files evenly between these 2 mirror sets. In the configuration below, Brick1 and Brick2 is 1 mirror set, and Brick3 and Brick4 is your second mirror set. In this configuration approximately 50% of the files will go on the first mirror set and 50% will go on the second mirror set. This means that if you shut down a single server, all of your files will be available. If you were to shut down two servers that were not both a part of the same mirror set like Brick1 and Brick3, then all of your files would still be available. If you shut down 2 servers that are part of the same mirror set, then the files on that set will not be available until one of those servers comes back up. This is what happened below when you shut down Brick3 and Brick4. -Jacob -----Original Message----- From: gluster-users-bounces at gluster.org [mailto:gluster-users-bounces at gluster.org] On Behalf Of Niclas Hughes Sent: Thursday, February 10, 2011 6:11 AM To: gluster-users at gluster.org Subject: Missing files and folders version 3.1.2 latest Build Jan 18 2011 Setup: Volume Name: brick2 Type: Distributed-Replicate Status: Started Number of Bricks: 2 x 2 = 4 Transport-type: tcp Bricks: Brick1: linguest2:/data/brick2 Brick2: linguest3:/data/brick2 Brick3: linguest4:/data/brick2 Brick4: linguest5:/data/brick2 If you read a write files to each of these machines, then make sure that these files are accessible on all 4 machines. Now shutdown linguest4 and linguest5. Originally the 2 machine setup was type replicate but when you add two further machines it changes the type to be "Type: Distributed-Replicate" as above. Now that the two machines have been halted the other two machines now have files missing. As the documentation states: "Distributed replicated volumes replicate (mirror) data across two or more nodes in the cluster" but if it was a mirror then I would have expected the 2 machines to still have access to all the files. Does anyone know if this is what is meant to happen or is this a bug. Also this has been tested many times and this is the result every time. Thanks Nick
