zaxxon was of course correct to point this counter out, but i would like to explain it a bit more, for completeness:

This counter (and similar ones, like "paging space I/Os blocked with no psbuf", etc.) are collected from boot time. Therefore the value itself is not that interesting but its change over time is.

A high value which doesn't (or does hardly) change over time hints to a problem in the past which is not occurring right now. That doesn't necessarily mean that the problem is solved, just its symptom is not occurring. Always take the number one advice of performance monitoring/tuning to heart: a problem is not solved when its symptom cannot be observed, but only when the symptom doesn't occur any more and you understand why this is so!

If you have to trace this or a similar counter always take snapshots over some extended period (every hour, every day, ...) and compare. Notice how much the counter increases - that is: the order of magnitude of the increment. If the counter increases in the tens over a day everything is ok, if it increases in the hundreds over an hour you have to investigate, if the increment is even higher you have to act immediately.

I hope this helps.

bakunin