Well, someone tried setting the 2KB pool to 0MB (which matches with one of your other threads regarding eliminating a cache/pool):
====================
IO Size Wash Size Config Size Run Size APF Percent
-------- ------------- ------------ ------------ -----------
2 Kb 64 Kb 0.00 Mb 239.27 Mb 10 <<<=== changed from 239.27 Mb to 0.00 Mb
16 Kb 61440 Kb 834.96 Mb 834.95 Mb 10
====================
While the attempt to change the 'Run Size' of the pool will take place during the next reboot, it appears the 'Wash Size' was automatically reduced to 64 Kb (or someone explicitly defined it to this tiny value).
As Brett's mentioned, the small wash size (64 Kb) is likely causing the error message.
And since the dataserver is complaining about the 2KB being too small this would tend to indicate the dataserver still needs to use the 2KB pool, which would tend to indicate you cannot eliminate the 2KB pool.
To get rid of the error message I'd recommend you add space back to the 2KB pool (eg, try something like 10MB), and make sure this resets the wash size to something a bit larger than 64Kb.
If you still get the error message then you may need to bump up the size of the 2KB pool a bit more and/or increase the size of the wash.