>>> Digimer <[email protected]> schrieb am 20.03.2019 um 17:37 in Nachricht <[email protected]>: > Note; > > Cluster filesystems are amazing if you need them, and to be avoided if > at all possible. The overhead from the cluster locking hurts performance > quite a lot, and adds a non-trivial layer of complexity.
Yes, that's the true challenge. It's sad that NFS might provide better performance than a cluster filesystem will. > > I say this as someone who has used dual-primary DRBD with GFS2 for > many years. > > To expand on why you can't use something like ext4; Non-cluster-aware > file systems expect all changes to the backing device to go through it. > So there's no mechanism to tell the FS on one node that blocks have > changed because of actions on another node. Likewise, they have no > mechanism to coordinate sane and safe access to blocks. These mechanisms > are exactly what makes a cluster FS what it is. > > digimer > > On 2019-03-20 11:52 a.m., Emmanuel Gelati wrote: >> If you need to access from both nodes, you need to use primary/primary >> mode in drbd >> >> Il giorno mer 20 mar 2019 alle ore 16:51 JCA <[email protected] >> <mailto:[email protected]>> ha scritto: >> >> OK, thanks. Yet another thing I was not aware of in the clustering >> world :-( >> >> On Wed, Mar 20, 2019 at 9:41 AM Valentin Vidic >> <[email protected] <mailto:[email protected]>> wrote: >> >> On Wed, Mar 20, 2019 at 09:36:58AM -0600, JCA wrote: >> > # pcs -f fs_cfg resource create TestFS Filesystem >> device="/dev/drbd1" >> > directory="/tmp/Testing" >> > fstype="ext4" >> >> ext4 can only be mounted on one node at a time. If you need to >> access >> files on both nodes at the same time than a cluster filesystem >> should >> be used (GFS2, OCFS2). >> >> -- >> Valentin >> _______________________________________________ >> Manage your subscription: >> https://lists.clusterlabs.org/mailman/listinfo/users >> >> ClusterLabs home: https://www.clusterlabs.org/ >> >> _______________________________________________ >> Manage your subscription: >> https://lists.clusterlabs.org/mailman/listinfo/users >> >> ClusterLabs home: https://www.clusterlabs.org/ >> >> >> >> -- >> .~. >> /V\ >> // \\ >> /( )\ >> ^`~'^ >> >> _______________________________________________ >> Manage your subscription: >> https://lists.clusterlabs.org/mailman/listinfo/users >> >> ClusterLabs home: https://www.clusterlabs.org/ >> > > > -- > Digimer > Papers and Projects: https://alteeve.com/w/ > "I am, somehow, less interested in the weight and convolutions of > Einstein’s brain than in the near certainty that people of equal talent > have lived and died in cotton fields and sweatshops." - Stephen Jay Gould > _______________________________________________ > Manage your subscription: > https://lists.clusterlabs.org/mailman/listinfo/users > > ClusterLabs home: https://www.clusterlabs.org/ _______________________________________________ Manage your subscription: https://lists.clusterlabs.org/mailman/listinfo/users ClusterLabs home: https://www.clusterlabs.org/
