On Fri, Jul 30, 2010 at 02:18:37AM +0200, J.A. Magallón wrote: > First of all, plz correct me if this is in some kind of wiki, web page or > the like, but I have not been able to find it. All this things should be > on a document somewhere, perhaps even in the kernel itself... Agreed. > These are the things I have found out (thanks to your answers...). > I'm a long time unix admin, not new to NFS, but all this things were not > obvious to me, so perhaps they deserve to be in a document, something like > "NFS 3 to 4 migration for dummy admins": > > - Everything just works if you mount shares as nfs4. Even, if you have a > bunch of linux boxen with recent kernel/nfs-utils, probably you are > already doing nfs4... modern mount tries nfs4 first. > > - Using nfsroot with fsid=0 is not mandatory, nor bind-mounting everything > under some /export (like many documents say), that only forces you to We should update that documentation. > use the old way of specifying paths in the server (absolute, not > relative to /export). > > - Even if you use nfsroot(fsid=0), and you mount it on the client > at /somepoint, you are not forced to mount everything else under > /somepoint (plz, correct me if I'm wrong). > > - You can strip your server for NFS4, but not too much... Old daemons > are still needed locally. For example, you can get rid of NFS2 and > UDP for nfsd (-N 2 -U, -any os still uses NFS2??-), and old > mount protocols (-N 1 -N 2 for mountd)... > > - ... but they can be firewalled, use is just local > > - portmap/rpcbind is not needed, but still used because nfsd is not > yet proper clean for only-nfs4-behavior. > > There are also some things I have not been able to discover, like > using the interesting things of NFS4: > > - How do you activate delegations ? Is this an automatic thing, or > do I have to add any option somewhere ? It's automatic. You can turn them off on the server side with /proc/sys/fs/leases-enable. They'll be turned off automatically if the server can't open a tcp connection back to the client (for example, if the client is behind a NAT). > - How do you use cache ? Many docs talk about fsc option, but man > does not mention it (nfs-utils 1.2.2). > I have tried to use cachefiles module, and cachefilesd, but > when I try to run it, I get: I haven't used that. I don't believe there's anything NFSv4-specific about it. --b. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
