Forcing NFS4 write cache flush

fantasygoat · 04-11-2012, 05:02 PM

I have two servers sharing an NFS4 mount. Here's the fstab entry:

Quote:

media.prod:/media /exports/media nfs4 intr,noatime,nodiratime 0 0

The issue we're having seems related to the local write cache. A load-balanced request will come in, and the application on the first server will create a directory, but the second request hitting the second server will not see the directory until it tries a second or third time.

Is there anything I can do at the application level to initiate write cache flush so that the file or directory creation propagates as quickly as possible to all NFS mounts?

smallpond · 04-13-2012, 03:37 PM

Most likely the write request is happening, but the other client is caching so it doesn't get the right result when it looks.

Setting actimeo=0 will disable attribute caching on the clients. Up to you if you want to take the performance hit.

fantasygoat · 04-13-2012, 04:02 PM

I was hoping to find a way to do it conditionally, without having to disable it on the full mount.