Thanks for the syslogs - we're already thinking of moving the logs to a separate cache.
Re:
> PS: the size you have defined for your named cache looks sufficient for me, check if the cache hit ratio satisfy you.
What does "check if the cache hit ratio satisfyyou." mean ?
Getting 1000 pages off the SAN takes 2s.
Getting 1000 pages off cache takes 2ms
We want to cache as much as we can - the more we cache the better the performance.
We get 99% cache hits 95% of the time and 95% cache hits the remainder 5% of the time.
Thats a few million page reads from the SAN each day.
Obviously I'd want to cache the whole DB but I can't afford a server with several Tb's of RAM.
So does the "cache hit ratio satisfyyou" ? No. I want it as high as possible.
How can I achieve this without using trial and error ?