Re: [Gluster-users] Doubts re: remove-brick
Hi Diego, Remove brick command is a two-step operation. When started, those bricks are marked deprecated and no writes are sent to those bricks. Rebalance is started as part of the remove brick process. Once the remove brick is complete (By checking the status), commit the operation. -- Thanks and Regards Aravinda https://kadalu.tech On Fri, Nov 18, 2022 at 7:23 PM Diego Zuccato wrote: > Hello all. > > I need to reorganize the bricks (making RAID1 on the backing devices to > reduce memory used by Gluster processes) and I have a couple of doubts: > - do moved (rebalanced) files get removed from source bricks so at the > end I only have the files that received writes? > - do bricks being removed continue getting writes for new files? > > Tks. > > -- > Diego Zuccato > DIFA - Dip. di Fisica e Astronomia > Servizi Informatici > Alma Mater Studiorum - Università di Bologna > V.le Berti-Pichat 6/2 - 40127 Bologna - Italy > tel.: +39 051 20 95786 > > > > > Community Meeting Calendar: > > Schedule - > Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC > Bridge: https://meet.google.com/cpu-eiue-hvk > Gluster-users mailing list > Gluster-users@gluster.org > https://lists.gluster.org/mailman/listinfo/gluster-users > Community Meeting Calendar: Schedule - Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC Bridge: https://meet.google.com/cpu-eiue-hvk Gluster-users mailing list Gluster-users@gluster.org https://lists.gluster.org/mailman/listinfo/gluster-users
Re: [Gluster-users] Doubts re: remove-brick
Il 20/11/2022 09:39, Strahil Nikolov ha scritto: Have you checked https://staged-gluster-docs.readthedocs.io/en/release3.7.0beta1/Features/rebalance/ ? I know it's old but it might provide some clarity. The files are removed from the source subvolume to the new subvolume. Ok, Tks! RH's numbering is really confusing. Why can't they simply use the official release number? :( And having lots of docs paywalled doesn't help either. Removed bricks do not get any writes, as during the preparation - a rebalance is issued which notifies the clients to use the new DHT subvolume. IIUC there's a mismatch between what you say and the warning I get when starting a remove-brick operation: "It is recommended that remove-brick be run with cluster.force-migration option disabled to prevent possible data corruption. Doing so will ensure that files that receive writes during migration will not be migrated and will need to be manually copied after the remove-brick commit operation. Please check the value of the option and update accordingly. Do you want to continue with your current cluster.force-migration settings? (y/n)" If files being migrated don't receive writes (I assume "on the original brick"), then why is that note needed? Most probably I'm missing some vital piece of information. [BTW my cluster.force-migration is already off... that warning is a long standing issue that seems is not easily fixable] -- Diego Zuccato DIFA - Dip. di Fisica e Astronomia Servizi Informatici Alma Mater Studiorum - Università di Bologna V.le Berti-Pichat 6/2 - 40127 Bologna - Italy tel.: +39 051 20 95786 Community Meeting Calendar: Schedule - Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC Bridge: https://meet.google.com/cpu-eiue-hvk Gluster-users mailing list Gluster-users@gluster.org https://lists.gluster.org/mailman/listinfo/gluster-users
Re: [Gluster-users] Doubts re: remove-brick
Have you checked https://staged-gluster-docs.readthedocs.io/en/release3.7.0beta1/Features/rebalance/ ? I know it's old but it might provide some clarity. The files are removed from the source subvolume to the new subvolume. Removed bricks do not get any writes, as during the preparation - a rebalance is issued which notifies the clients to use the new DHT subvolume. Best Regards,Strahil Nikolov On Fri, Nov 18, 2022 at 15:52, Diego Zuccato wrote: Hello all. I need to reorganize the bricks (making RAID1 on the backing devices to reduce memory used by Gluster processes) and I have a couple of doubts: - do moved (rebalanced) files get removed from source bricks so at the end I only have the files that received writes?- do bricks being removed continue getting writes for new files? Tks. -- Diego Zuccato DIFA - Dip. di Fisica e Astronomia Servizi Informatici Alma Mater Studiorum - Università di Bologna V.le Berti-Pichat 6/2 - 40127 Bologna - Italy tel.: +39 051 20 95786 Community Meeting Calendar: Schedule - Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC Bridge: https://meet.google.com/cpu-eiue-hvk Gluster-users mailing list Gluster-users@gluster.org https://lists.gluster.org/mailman/listinfo/gluster-users Community Meeting Calendar: Schedule - Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC Bridge: https://meet.google.com/cpu-eiue-hvk Gluster-users mailing list Gluster-users@gluster.org https://lists.gluster.org/mailman/listinfo/gluster-users
