On February 18, 2020 1:16:19 AM GMT+02:00, Artem Russakovskii <archon810@xxxxxxxxx> wrote: >Hi all, > >We currently have an 8TB 4-brick replicated volume on our 4 servers, >and >are at 80% capacity. The max disk size on our host is 10TB. I'm >starting to >think about what happens closer to 100% and see 2 options. > >Either we go with another new 4-brick replicated volume and start >dealing >with symlinks in our webapp to make sure it knows which volumes the >data is >on, which is a bit of a pain (but not too much) on the sysops side of >things. Right now the whole volume mount is symlinked to a single >location >in the webapps (an uploads/ directory) and life is good. After such a >split, I'd have to split uploads into yeardir symlinks, make sure >future >yeardir symlinks are created ahead of time and point to the right >volume, >etc). > >The other direction would be converting the replicated volume to a >distributed replicated one >https://docs.gluster.org/en/latest/Administrator%20Guide/Setting%20Up%20Volumes/#creating-distributed-replicated-volumes, >but I'm a bit scared to do it with production data (even after testing, >of >course), and having never dealt with a distributed replicated volume. > >1. Is it possible to convert our existing volume on the fly by adding 4 > bricks but keeping the replica count at 4? >2. What happens if bricks 5-8 which contain the replicated volume #2 go >down for whatever reason or can't meet their quorum, but the replicated > volume #1 is still up? Does the whole main combined volume become >unavailable or only a portion of it which has data residing on >replicated > volume #2? > 3. Any other gotchas? > >Thank you very much in advance. > >Sincerely, >Artem > >-- >Founder, Android Police <http://www.androidpolice.com>, APK Mirror ><http://www.apkmirror.com/>, Illogical Robot LLC >beerpla.net | @ArtemR ><http://twitter.com/ArtemR> Distributed replicated sounds more reasonable. Out of curiocity, why did you decide to have an even number of bricks in the replica - it can still suffer from split-brain? 1. It should be OK, but I have never done it. Test on some VMs before proceeding. Rebalance might take some time, so keep that in mind. 2.All files on replica 5-8 will be unavailable untill yoiu recover that set of bricks. Best Regards, Strahil Nikolov ________ Community Meeting Calendar: APAC Schedule - Every 2nd and 4th Tuesday at 11:30 AM IST Bridge: https://bluejeans.com/441850968 NA/EMEA Schedule - Every 1st and 3rd Tuesday at 01:00 PM EDT Bridge: https://bluejeans.com/441850968 Gluster-users mailing list Gluster-users@xxxxxxxxxxx https://lists.gluster.org/mailman/listinfo/gluster-users
