The wash size for the 2k pool is very small. This message gets output when ASE needs a clean buffer to read data into but none are available. Increasing the size of the wash region causes more buffers to be flushed earlier, improving the chances that ASE will find a clean one (you want ASE to always be able to find a clean one).
The "config size" of 0 suggests that you are trying to drop this pool, however. So I think you either want to finish dropping it or reconfigure it for memory and increase the wash region size.
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bret