@@ -158,8 +158,8 @@ up to a maximum timeout length of 60 seconds.
The number of times the NFS client retries a request before
it attempts further recovery action. If the
.B retrans
-option is not specified, the NFS client tries each request
-three times.
+option is not specified, the NFS client tries each UDP request
+three times and each TCP request twice.
.IP
The NFS client generates a "server not responding" message
after
@@ -391,6 +391,16 @@ is 2 minutes, and the default value for background mounts is 10000 minutes
If a value of zero is specified, the
.BR mount (8)
command exits immediately after the first failure.
+.IP
+Note that this only affects how many retries are made and doesn't
+affect the delay caused by each retry. For UDP each retry takes the
+time determined by the
+.BR timeo
+and
+.BR retrans
+options, which by default will be about 7 seconds. For TCP the
+default is 3 minutes, but system TCP connection timeouts will
+sometimes limit the timeout of each retransmission to around 2 minutes.
.TP 1.5i
.BI sec= flavors
A colon-separated list of one or more security flavors to use for accessing
The total timeout for a "mount" attempt to a non-responsive server will always be a multiple of the time a single mount attempt in the kernel takes, which for TCP defaults to about 4 minutes. The documentation for the "retry" option seems to suggest that this can be used to set a maximum but it really sets a time after which to stop retrying. The total can be as much as "retry" plus the time for a single attempt. So clarify the documentation a bit, and also note that retrans defaults are different for UDP and TCP: #define NFS_DEF_UDP_RETRANS (3) #define NFS_DEF_TCP_RETRANS (2) Reported-by: Howard Guo<hguo@suse.com> Signed-off-by: NeilBrown <neilb@suse.com> --- utils/mount/nfs.man | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html