To answer my own question, no (at least not NFS 4): https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/ch-nfs.html
On Mon, Mar 21, 2016 at 3:46 PM James A. Robinson <jim.robin...@gmail.com> wrote: > I suppose I should pose the question to folks that use NFS, do you use TCP > or UDP for your NFS stack? > > > On Mon, Mar 21, 2016 at 3:29 PM James A. Robinson <jim.robin...@gmail.com> > wrote: > >> Running a packet trace while the problem was occurring let me see that >> the problem is that the NFS layer isn't even being involved for 3 minutes >> due to the TCP layer retrying for 3 minute before notifying the caller of >> the error. >> >> The client sends SYN packets, doesn't get an ACK, and finally times out >> after 3 minutes. The documentation for Linux (the client in this case) >> indicates the following default: >> >> tcp_syn_retries (integer; default: 5; since Linux 2.2) >> The maximum number of times initial SYNs for an active TCP >> connection attempt will be retransmitted. This value should >> not be higher than 255. The default value is 5, which >> corresponds to approximately 180 seconds. >> >> I think this means that it's not possible to get faster failover w/o >> modifying the default values for the TCP layer. This particular error is >> always going to take at least 3 minutes to surface. >> >> Jim >> >>
