01-12-2017
Sorry for not replying earlier, starting a new project kept me busy the lst few days.
There are a few things that don't quite add up IMHO:
First, the initial vmstat-output says ~200GB memory, but the avm column only shows ~21 mio of pages, which is ~80GB. Where is the difference? Please post the output of lsattr -El mem0 to verify how much (real) memory you really have.
Second, you said you have 15 cores configured, but the vmstat output shows 16. I presume that was just a typo on your part, but please confirm.
Third, further posted outputs of ps suggest that you have different DB instances running (fininddb and finabrodb). How many database instances are running simultaneously?
Fourth, i don't understand why there are so many archiver processes shown in the ps-outputs. What exactly is/are the DB(s) doing (in terms of how many requests and of which size typically) and how many logs (of which size) are typically produced per time unit? Are there any dumps being taken, exports running or the like?
In light of further information i am of the same opinion as Scrutinizer: your are perhaps a victim of double caching. The high number of pending I/Os and fs I/O blocked with no pbuf are further indicative of this assumption. If (see above, this is why this information is important) you have only one DB instance and you have 80GB of RAM and nothing else running on the system increase the SGA to ~60-70GB and see how that works. If you have set FILESYSTEMIO_OPTIONS=SETALL as suggested by agent.kgb Oracle should open its DB files with concurrent I/O even if the filesystem is not mounted with the CIO option. Concurrent I/O bypasses the OS caching of FS operations but i presume you haven't activated that yet otherwise the picture of two different caching systems blocking each other should not be seen even if the SGA is too small (as it probably is right now).
Finally, a suggestion: when you use vmstat on concurrent systems use the "-w" option. This way you get a neat table as output and it is easier to assess the picture.
I hope this helps.
bakunin
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