Re: [Gluster-users] Migrate from an NFS storage to GlusterFS
Harald Stürzebecher wrote: Would reexporting the GlusterFS volume as described in http://gluster.com/community/documentation/index.php/Storage_Server_Installation_and_Configuration#Add_NFSv3_Protocol work in this case? Re-export will work without problems. Vikas ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
Re: [Gluster-users] Migrate from an NFS storage to GlusterFS
2010/2/16 Vikas Gorur : > Olivier Le Cam wrote: >> >> Thanks Vikas. BTW, might it be possible to have the same volume exported >> both by regular-NFS and GlusterFS at the same time in order to migrate my >> clients smoothly? Is there any risks to get GlusterFS confused and/or the >> ext3 volume damaged? > > That would be quite risky. If you have both GlusterFS clients and NFS > clients operating on > the same files or directories there are chances of race conditions which > might lead > to lost files, GlusterFS getting confused, NFS getting confused etc. I > wouldn't recommend it. Would reexporting the GlusterFS volume as described in http://gluster.com/community/documentation/index.php/Storage_Server_Installation_and_Configuration#Add_NFSv3_Protocol work in this case? Harald Stürzebecher ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
Re: [Gluster-users] Migrate from an NFS storage to GlusterFS
On Tue, 16 Feb 2010 17:31:00 +0530 Vikas Gorur wrote: > Olivier Le Cam wrote: > > Thanks Vikas. BTW, might it be possible to have the same volume > > exported both by regular-NFS and GlusterFS at the same time in order > > to migrate my clients smoothly? Is there any risks to get GlusterFS > > confused and/or the ext3 volume damaged? > That would be quite risky. If you have both GlusterFS clients and NFS > clients operating on > the same files or directories there are chances of race conditions which > might lead > to lost files, GlusterFS getting confused, NFS getting confused etc. I > wouldn't recommend it. But isn't that a setup that every average user would expect to work? You can share data between nfs and a local (nfs-server) user, too. Is your file locking racy? Did you break atomic operations? Remember that long discussion about soft migrating data by just exporting already existing data via glusterfs without copying? This point is very similar. It is a common understanding in modern fs that multiple users of the same file should be managed by record- and/or file-locking. A network based fs on top of some other fs should behave just as it were some average local user - then your data should (and must) be safe. > Vikas -- Regards, Stephan ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
Re: [Gluster-users] Migrate from an NFS storage to GlusterFS
Olivier Le Cam wrote: Thanks Vikas. BTW, might it be possible to have the same volume exported both by regular-NFS and GlusterFS at the same time in order to migrate my clients smoothly? Is there any risks to get GlusterFS confused and/or the ext3 volume damaged? That would be quite risky. If you have both GlusterFS clients and NFS clients operating on the same files or directories there are chances of race conditions which might lead to lost files, GlusterFS getting confused, NFS getting confused etc. I wouldn't recommend it. Vikas -- Engineer - Gluster, Inc. ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
Re: [Gluster-users] Migrate from an NFS storage to GlusterFS
Vikas Gorur wrote: Olivier Le Cam wrote: Does it make sense to go that way? In fact, I don't have all the equipment required to switch to a (replicated/distributed) 4-bricks. This is why it came to my mind to do it step-by-step. Yes, the steps you outlined will work. Just export your existing volume using GlusterFS. When you add a new volume for replication, do an 'ls -lR' to trigger self-heal. Use the defrag script when you want to use distribute as well. Thanks Vikas. BTW, might it be possible to have the same volume exported both by regular-NFS and GlusterFS at the same time in order to migrate my clients smoothly? Is there any risks to get GlusterFS confused and/or the ext3 volume damaged? -- Olivier ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
Re: [Gluster-users] Migrate from an NFS storage to GlusterFS
Olivier Le Cam wrote: Does it make sense to go that way? In fact, I don't have all the equipment required to switch to a (replicated/distributed) 4-bricks. This is why it came to my mind to do it step-by-step. Yes, the steps you outlined will work. Just export your existing volume using GlusterFS. When you add a new volume for replication, do an 'ls -lR' to trigger self-heal. Use the defrag script when you want to use distribute as well. Vikas ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
Re: [Gluster-users] Migrate from an NFS storage to GlusterFS
Vikas Gorur wrote: Olivier Le Cam wrote: Hi - I already have an NFS server in production which shares Web data for a 4-node Apache cluster. I'd like to switch to GlusterFS. Do I have to copy the files from the NFS storage to a GlusterFS one, or may it work if I just install GlusterFS on that server, configuring a GFS volume to the existing storage directory (assuming, of course, the NFS server is shuuted down and not used anymore), then ls -lR? What kind of GlusterFS configuration do you intend to use? Distribute, Replicate, or both? At this step, I just wanna give it a try. I was actually thinking (if this is possible) to install GlusterFS on the current NFS server and switch from regular-NFS to GlusterFS (on both clients and server side). Then, if everything goes fine, add a second replicated brick (forcing synchronization). Then again, if everything is still fine, add two other bricks in order to distribute. Thanks to the "defrag" script, it should be possible to rebalance the files over the distributed storage with an acceptable disturbance. Does it make sense to go that way? In fact, I don't have all the equipment required to switch to a (replicated/distributed) 4-bricks. This is why it came to my mind to do it step-by-step. Thanks and best regards, -- Olivier Le Cam Département des Technologies de l'Information et de la Communication Académie de Versailles ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
Re: [Gluster-users] Migrate from an NFS storage to GlusterFS
Olivier Le Cam wrote: Hi - I already have an NFS server in production which shares Web data for a 4-node Apache cluster. I'd like to switch to GlusterFS. Do I have to copy the files from the NFS storage to a GlusterFS one, or may it work if I just install GlusterFS on that server, configuring a GFS volume to the existing storage directory (assuming, of course, the NFS server is shuuted down and not used anymore), then ls -lR? What kind of GlusterFS configuration do you intend to use? Distribute, Replicate, or both? Vikas ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
[Gluster-users] Migrate from an NFS storage to GlusterFS
Hi - I already have an NFS server in production which shares Web data for a 4-node Apache cluster. I'd like to switch to GlusterFS. Do I have to copy the files from the NFS storage to a GlusterFS one, or may it work if I just install GlusterFS on that server, configuring a GFS volume to the existing storage directory (assuming, of course, the NFS server is shuuted down and not used anymore), then ls -lR? Thanks, -- Olivier Le Cam Département des Technologies de l'Information et de la Communication Académie de Versailles ___ Gluster-users mailing list Gluster-users@gluster.org http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
