On 05/23/2018 02:15 AM, Olga Kornievskaia wrote:
we saw similar issues with early version of RHEL6 kernels, but this was fixed in the later version.
and it's possible now to set timeout with
dataserver_timeo and dataserver_retrans
bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1175413
Which which kernel do you observe it?
Upstream kernel. But I'm arguing that there shouldn't be a need to
specify a dataserver_timeo because it shouldn't timeout at all just
like MDS operations.
Also curiously, "man nfs" doesn't list "datasever_timeo" option and
when I try to use it on a RHEL7.4 machine it says incorrect option.
Also grep thru the upstream kernel code for "dataserver_timeo" is
empty too.
I still see these options (as module parameters to
nfs_layout_nfsv41_files module) in the mainline kernel (4.17-rc7).
We are facing the problem with IO being routed through MDS when DS is
momentarily unavailable (for e.g. DS restart or DS failover). Wondering
if anyone found this timeout helpful in the case when the network
connection goes down as part of DS failover for instance. In the past,
we had observed that the IO is being routed through MDS immediately
after DS is restarted and MDS won't be in a position to complete the IO.
Regards,
Suresh
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