[Bugs] [Bug 1354439] nfs client I/O stuck post IP failover

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1354439



--- Comment #9 from Soumya Koduri <skoduri at redhat.com> ---
To verify the portblock RA introduced, below are the tests performed.

A 2-node nfs-ganesha HA setup is used.

On the client machine:
Attached 'continuous.sh' script is ran which continuously generates I/O on a v3
mount(since grace doesn't affect v3 clients) of VIPA configured on one of the
servers.

portblock_test.sh - 
This script triggeres failover & failback between two nodes for about 100
iterations. After VIP is successfully
failed-over/failed-back, there is a sleep of 10sec for the I/O to continue for
sometime.

That means if there is no I/O generated between two iterations, that resembles
I/O getting stuck 

As can be seen from the test results attached (test_results_withoutfix), I/O
got stuck in between few iterations without the fix 

Tue Aug 2 11:28:11 IST 2016
43.7 Tue Aug  2 11:27:27 IST 2016 - Loop4
Starting Failover from 10.70.43.7 Tue Aug  2 11:27:38 IST 2016 - Loop5
Completed Failover from 10.70.43.7 Tue Aug  2 11:28:00 IST 2016 - Loop5
Starting Failback to 10.70.43.7 Tue Aug  2 11:28:10 IST 2016 - Loop6
Tue Aug 2 11:28:11 IST 2016


But that wasn't the case with the fix applied (test_results_withfix)

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