Alex Wakefield wrote on 16/09/2020 06:33: > > We have a distribute replicate gluster volume running Gluster 6.10 on > Ubuntu 18.04 machines. Its a 2 x 2 brick setup (2 bricks, 2 > replicas). > > We need to migrate the existing bricks to new hardware without > downtime and are lost at whats the proper way to do it. I've found > this post [1] which suggests that we can do a replace-brick command > and move it to the new server without downtime but this [2] > mailinglist thread suggests this isn't the correct way to do it > anymore? > > The gluster docs [3] have information for replacing _faulty_ bricks > but our bricks aren't faulty, we just need to move them to new > hardware. We've tried using this method mentioned in the docs in the > past but have found that the volume gets into weird states where > files go into read-only mode or have their permissions set to > root:root. It basically plays havoc on the fs mount that the clients > use. > > Any help would be greatly appreciated. Apologies if I've left any > information out. Hi, We had this same quandary in March[1]. We first tested using add-brick/remove-brick which resulted in permissions/ownership mayhem. After some head scratching, I took the replace-brick approach which worked fine. Something like so for each brick, waiting for all heals to complete between brick replacements: $ sudo gluster volume replace-brick volname stor-old-1:/data/glusterfs/volname/brick1/brick stor-new-1:/data/glusterfs/volname/brick1/brick commit force I did this on a live volume starting with the data I cared about least first. Nerves were properly on edge for the first volume I can tell you! :-). I would, if feasible, recommend doing a test migration on a small volume and checksum the data before and after. Thanks. Ronny [1] https://lists.gluster.org/pipermail/gluster-users/2020-March/037786.html -- Ronny Adsetts Technical Director Amazing Internet Ltd, London t: +44 20 8977 8943 w: www.amazinginternet.com Registered office: 85 Waldegrave Park, Twickenham, TW1 4TJ Registered in England. Company No. 4042957
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