[Ocfs2-users] ping_pong using o2cb and cman

[Sunil Mushran]

ping_long tests the fcntl() user locks.

ocfs2 supports clustered fcntl() locking with cman and pacemaker
cluster stacks. Not with o2cb.

ocfs2 supports clustered flock() with all stacks. o2cb, cman and pacemaker.

On 01/17/2011 07:25 AM, Dan Warner wrote:
> I was testing ocfs2 on a 2 node cluster set up.
>
> ocfs2-tools version is 1.6.3
> ocfs2 kernel version is 2.6.36
>
> Using cman on 2 nodes
>
> node02 dw # ping_pong -rwm /data/test.dat 3
> data increment = 2
>       14 locks/sec
>
> node01 dw # ping_pong -rw /data/test.dat 3
> data increment = 2
>       10 locks/sec
>
> node02 dw # ping_pong -r /data/test.dat 3
>     1980 locks/sec
>
> Using cman on 1 node
>
> node02 dw # ping_pong -rwm /data/test.dat 3
> data increment = 1
>     3165 locks/sec
>
> node02 dw # ping_pong -rw /data/test.dat 3
> data increment = 1
>     3289 locks/sec
>
> node02 dw # ping_pong -r /data/test.dat 3
>     3267 locks/sec
>
> The above seems reasonable and behaved as expected when the program was stopped and started repeatedly on either node. So it passed the test.
>
>
>
> Unfortunately o2cb didnt behave as expected.
>
> Using o2cb on 2 nodes
>
> node02 dw # ping_pong -rwm /data/test.dat 3
> data increment = 199
> data increment = 76
> data increment = 1
> data increment = 117
> data increment = 84
> data increment = 1
> data increment = 212
> data increment = 211
> data increment = 1
> data increment = 225
> data increment = 85
> data increment = 1
> data increment = 237
> data increment = 158
> data increment = 1
> data increment = 75
> data increment = 235
> data increment = 1
> data increment = 199
> data increment = 4
> data increment = 1
>   171803 locks/sec
>
> and occasionally you will get the data increment remaining at 1 when 2 nodes have joined
>
> node02 dw # ping_pong -rw /data/test.dat 3
> data increment = 2
>       45 locks/sec
>
> node01 dw # ping_pong -r /data/test.dat 3
>  2155175 locks/sec
>
> Using cman on 1 node
>
> node02 dw # ping_pong -rwm /data/test.dat 3
> data increment = 1
>  2230553 locks/sec
>
> node02 dw # ping_pong -rw /data/test.dat 3
> data increment = 1
>   299492 locks/sec
>
> node02 dw # ping_pong -r /data/test.dat 3
>  2249787 locks/sec
>
> The mmap test failed. The read/write test 'usually' worked but frequently didn't increment the 'data increment' to 2, when the program was running on both nodes.
>
> Any suggestions why this isn't working as expected?
>
> Thanks, Dan
>
>
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