On Apr 22, 2008, at 2:00 PM, msl wrote: >> >> On Apr 22, 2008, at 12:16 PM, msl wrote: >> >>> Hello all, >>> I think the two options are very similar in the >> "cliente side >>> view", but i want to hear from the experts... So, >> somebody can talk >>> a little about the two options? >>> We have two different layers here, i think: >>> 1) The "async" from the protocol stack, and the >> other... >>> 2) From the filesystem point of view. >>> >>> What makes me think that the "first" option could >> be more "quick" >>> for the client, because the "ack" is in a higher >> level (NFS protocol). >> >> The NFS client has control over WRITE requests in >> that it >> may ask to have them done "async" and then follow it >> with >> a COMMIT request to ensure the data is in >> stable-storage/disk. > Great information... so, the "sync" option on the server (export) > side is just a "possible" option for the client requests? I mean, > the "sync/async" option is a requirement in a nfs write request > operation? When i did the question, i was talking about the "server > side", i did not know about the possibility of the client requests > "sync/async".
The Solaris NFS server does not offer a method to specify "sync/ async" behavior for NFS WRITE requests. The Solaris server will do what the client asks it to do. >> However, the NFS client has no control over namespace >> operations >> (file/directory create/remove/rename). These must be >> done >> synchronously -- no way for the client to direct the >> operational >> behavior of the server in these cases. > If i understand well, here the "zil_disable" is is a problem for > the NFS semantics... i mean, the service will be compromise, > because the nfs client can't control the "namespace operations". > What is a big diff in my initial question. Yes, zil_disable can be a problem as described by Eric here: http://blogs.sun.com/erickustarz/entry/zil_disable >> >> Spencer >> > Thanks a lot for your comments! Anybody else? > ps.: how can i enable async in nfs server on solaris? just add > "async" for the export options? See above; not possible. Spencer
