Hello,
we want to migrate to CentOS 7(.1) , Server, Client etc ...
Right now we need to suspend that because we have some serious issues with NFS4 shared ZFS ( kernel module - zfs on linux project ) Volumes and CentOS 7 clients.
Our current server are CentOS6.5, if we share a zfs volume and do the following on this share: client A reads/access file "z.txt". Now client B replaces (copy, move, unlink+link ) files "z.txt" with a new different version and now client A reads/access the file "z.txt" ( and only the file - do not do anything which does a "stat" on the file e.g. "cat z.txt") the old version/content is read. As long as you do something that issues a "stat" for the file/dir.
This is really a problem because a soon you are not browsing through the dirs e.g. updating some scripts or anything automated the changes are not recognized by the client.
This does not happen with a ext4 share. This also happen with a centos7.0 NFS Server and ZFS/XFS. We permute pretty much every nfs mount/share option - it always happens. Nothing does help. This does not happen with a Centos7.1 server and a centos7.1 client and xfs (NFS4.1). Of course it works with our current client server Version: Ubuntu 12.04 / CentOS 6.5.
It really does not seem to be a zfs issue - it does look more like a nfs problem with certain filessystems. I asked this already on the zfs mailing list.
So is there something I can do? Is the problem known? Is there a workaround , patch or fix?
I am still unsure if I missed something completely because the problem is just so serious...
With kind regards
Timo Ballin
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